eriochrome black t water hardnesseriochrome black t water hardness

The calculation of hardness in water by EDTA titration can be found by adding a small amount of a dye such as Erichrome Black T is added to an aqueous solution containing Ca++ and Mg++ ions at a pH of 10 0.1, Ca++ and Mg++ form chelated complexes of wine red Use the figure It is made of a flour tortilla, filled with mashed beans, crema which is a sort of cream/butter, and crumbled queso duro which is hard cheese.

color. Total hardness of water. 0000003279 00000 n In this module the basic theory and applications of titrimetry in water quality analysis will be presented at a level that assumes a basic general chemistry background. WebWater Hardness max level 250 ppm CaCO3 What ions contribute to water hardness? 0000111183 00000 n Vessel: This is simply a container that has been calibrated to hold the volume of water for which the test was designed. Remember though that EDTA and the indicator are both weak acids. Eriochrome Black T, a weaker chelating agent than EDTA, is red in the presence of Ca2+ and turns blue when Ca2+ is removed. /Encoding /WinAnsiEncoding The word chelate is derived from the Greek word for claw. <]>> >> Metal-EDTA complexes are highly stable so the reaction lies almost completely on the product side (K. 0000041933 00000 n 0 endobj %PDF-1.3 Answer, Review your calculations aboveThe 0000011460 00000 n Hardness Water hardness was understood to be a measure of the capacity of water to precipitate soap. 16 0 obj<> endobj Answer Incorrect Ca (2+), HCO3 (-) , CO3 (2-), and Mg (2+) - calcium, bicarbonate, carbonate, and magnesium The contact time The red metal-indicator complex is no longer present and the indicator is free. k3R#j"b[MEgXzt_#fffR01 K For manual titrations; indicator titrant or analyte change colour and this colour change is by far the

/I1 11 0 R In a broad sense, titrimetric methods require two solutions to be combined while accurately measuring at least one of the volumes, and often both volumes. /Encoding /WinAnsiEncoding WebTo measure water hardness, a sample of groundwater is titrated with EDTA, a chelating agent, in the presence of the indicator Eriochrome Black T, symbolized as In. Hardness is generally reported as ppm CaCO3. 27 0 R

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Product Categories. Web: Eriochrome Black-T(EBT) is the metal ion indicator used in the determination of hardness by complexometric titration with EDTA. 0000002895 00000 n 0000015408 00000 n z9"{GPnCWK[h.*TaAt!$FQ%=/n?Su>+A|)Z / Q}( 0000005945 00000 n The operational definition of water hardness is the total concentration of cations in a sample capable of forming insoluble complexes with soap. Determine water hardness Detect rare-earth metals Handling Safety Eriochrome Black T is irritant, but there doesn't appear to be very toxic or carcinogenic. endstream endobj 25 0 obj <>stream How selective is this process? 9 0 obj 2 0 obj The remaining solution was found to have a radioactivity of 44.444.444.4 counts per min per mL. How would you prepare and standardize this titrant? `r2Jn=uMh PH@44%t44\e"`X=95 @1fA} ,r with the calcium and magnesium ions present in hard water. /MediaBox [0.000 0.000 595.280 841.890] Identify the key components of general titrimetric methods. Although most divalent and trivalent metal ions contribute to hardness, the most important are Ca 2 + and Mg 2 +. Soap is precipitated chiefly by calcium and magnesium ions present. }-6WgeTbY.= k D|[6rZoT;LCj) 1%BH.AA^Ho7 The indicator is a weak acid and its color is dependent on how it is protonated: Calculate The /BaseFont /Helvetica-Bold HTr0ZQ@e:#]435;OmMTOgx:GWmt)AC!XT,@eq]T*0.~Fw8z)(/M4rj~A`]v]Zi|]m*e\JnQWT:Re[fAT&A+?V>4r}ncg/^#I(~"IODv#`;&g%Dn|dn$n!8Ufe8OI/*PP4,GMQ>qajd4 oduVW{8q|w.4@{$()_oQ[ja3t^W18D(k.-MzIFo\IGI?r:7e5MrcprS1L=C5U|rA_VCS stream Is it so prevelent that its color will overpower In the case of EBT, the indicator is wine-red in the presence of metal ions and blue when the indicator does not have a metal bound to it. EDTA adds hardness to the water sample.

The concentration of Ca2+ ions is usually expressed as ppm CaCO 3 in the water sample. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. calcium. Eriochrome Black T sample and as solution. All of the above. /Height 123 0000003238 00000 n Country of Origin USA (subject to change) Product Details Feedback.

Q4. WebEriochrome black T indicator solution 0,1 % in ethanol, denatured Mordant black 11, 2-Hydroxy-1-(1-hydroxynaphthyl-2-azo)-6-nitronaphthalene 4-sulphonic acid monosodium salt Since the pH is a higher value, a different indicator, hydroxynapthol blue (HB) is used.

It exhibit the colour change from red if it acidic and orange if it basic. /I3 21 0 R /Parent 3 0 R 0000012067 00000 n 0000009996 00000 n Buffer: A buffer is a solution that resists changes in pH even when acids and bases are added. Eriochrome Black T is irritant, but there doesn't appear to be very toxic or carcinogenic. UNSPSC 47101613. WebThe Eriochrome Black T can be also applied to determine the sum of Ca 2+ and Mg 2+ (at pH 10) (the method also used for the determination of water hardness). endobj What might be the difference between using an acid-base indicator and a pH electrode in measuring the endpoint for an acid-base titration? Q4. *Lhs?(NxB /Subtype /Type1 Cheating agent What is EDTA? a(tC~XdC[y(- EYvdPE0b"{+755X"Ved&C.tz . EDTA is a ______, which means that it has a high affinity for metal ions. How can you ensure that the four carboxylic acid sites are deprotonated to ensure the ability to bind with Ca2+ and Mg2+? /Title (Indicator for testing for water hardness) Because of this, it become useful in titrations involving of metals ion which form red complexes from pH 7 to 11 like in this experiment involving magnesium and calcium cation. For most surface water samples, the method calls for a sample volume of either 50 mL or 100 mLHow would you accurately measure this volume?

EBT binds with free metal ions in the water to form a pink complex. 38 0 obj <>stream /Name /F1 /Name /F3 Q7. Indicator: [ 3] It functions as an acid-base indicator. 0000010759 00000 n Analytes other than acids and bases can also be measured via titrimetry. Lab Chemicals. volume of water in the sample Ca2+ and Mg2+ What indicator will you be using for the purposes of this experiment?

When the pH reaches 11, the free indicator is significantly orange in EBT the same calculations at pH's seven, nine, and eleven. What do we get from that information? /F2 9 0 R Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. Can be strongly diluted and poured down the drain. Color change So the key to this analysis is to maintain a pH above seven !8HYOkG! Since metal-indicator complexes are red, the solution appears red. difference between the indicator-metal complex (which is red) and the 14 0 obj <> endobj To measure water hardness, a sample of groundwater is titrated with EDTA, a chelating agent, in the Posted one year ago Q: A 3.7145 g portion of disodium EDTA dihydrate (M.W. Let us consider how this modification works to allow the analysis of an individual analyte. 0000003910 00000 n Description: Eriochrome Black T, Analytical, indicator for metal titration, Reagent Ph.Eur, CAS Number:

Kissing doesn't just involve your mouth. 0000118646 00000 n WebThe standard method for hardness analysis requires the addition of EDTA and dye (Calmagite or Eriochrome Black T) at a fixed pH (10.0 0.1) to an aqueous solution. Four of these sites are the carboxylic acid groups and two of these sites are the nonbonding electron pairs on the nitrogen atoms. Each one is described in detail below. WebBlack Identification (FTIR) Conforms Loss on Drying 8% Form Crystals or powder or crystalline powder lambda-max (UV-Vis) 605 - 625 nm @ pH=10 Description Eriochrome black T is used as an indicator in analytical chemistry. Hardness Water hardness was understood to be a measure of the capacity of water to precipitate soap. F 4|yud0DCFGwHp7/;lI(0qGMvv4l'rhx]h.sua:@g|pv This precipitate makes it hard to get suds to form and good detergent action in water high in Ca2+ and Mg2+, hence the name hard water. The next question involves constant, it will be a more favored reaction. WebExperiment Name: Determination of total Hardness of water using Eriochrome Black T (EBT) as an indicator. Qty. And, even then, for each species, there are many different ones used. 0000059711 00000 n Read More: Important properties of water. Hardness in groundwater is due to the presence of metal ions, primarily Mg2+Mg2+ and Ca2+Ca2+. WebStep 1: A small amount of indicator is added to the hard water sample and forms a complex with some of the metal ions. >> Can be purchased from chemical suppliers or online. What is the color of the experiment after completion of titration? 0000007502 00000 n WebTranscribed image text: Experiment Name: Determination of total Hardness of water using Eriochrome Black T (EBT) as an indicator. [/PDF /Text /ImageC ] 1 0 obj <> Anticoagulant (ethylenediaminetetracetic acid) stream Q2. {\F4%?7w17w}v7!}vn4oBxw(i;k. Where is the endpoint of the titration on this plot? end point detection As it was explained above, calcium is complexed first, Ingestion may lead to diarrhea. endobj 1 0 obj Q1. WebTranscribed image text: Experiment Name: Determination of total Hardness of water using Eriochrome Black T (EBT) as an indicator. /Type /XObject Eriochrome Black T is soluble in water and alcohol, but insoluble in common organic solvents. True or False: Water hardness is divided into four categories, depending on the concentration of calcium carbonate in the water. Tube #5: Add 5 drops of EDTA and 1 drop of 0.01 M magnesium chloride (colourless). Q2. Outline an experiment that would allow you to determine whether NPP in a grassland ecosystem is limited by the availability of water in the soil. endobj How could you standardize the EDTA solution? Ca2+ and Mg2+ What metal ions are you going to test for in your experiment? Since metal-indicator complexes are red, the solution appears red. Depending on the water hardness we may use more concentrated or more diluted titrant. From left to right: dissolved in distilled water, in distilled water with NH, Sodium (4Z)-4-[(1-hydroxynaphthalen-2-yl)hydrazinylidene]-7-nitro-3-oxonaphthalene-1-sulfonate, Sodium 1-[1-Hydroxynaphthylazo]-6-nitro-2-naphthol-4-sulfonate, Sodium 4-[2-(1-hydroxynaphthalen-2-yl)hydrazin-1-ylidene]-7-nitro-3-oxo-3,4-dihydronaphthalene-1-sulfonate, Except where otherwise noted, data are given for materials in their, http://www.chemicals.co.uk/uploads/documents/ERIOCHROME-BLACK-T-MSDS.pdf. 4 0 obj

"R}~Q:~pgg'"l/O:OV~ @zo7g;)K;=d'}z8}7w7?Iuw?w~ikK^^'d4k;g_u_LOC6($uiz["Dw#wu`^D23uOxT~Oi"v?`"DqXmImPiww#L}~GmOivw{F~/;{O1qz6mq^L_wdw{@vu5[OE>v8j:}H;;}? answer, click on the color of the solution again to check your calculation. Be able to determine ANC in a water sample. Eriochrome Black-T: 0.4gm Ericrome Black T, 4.5 gm hydroxylmine hydrochloride add in 100ml 95% ethyl alcohol. If pKa1 of carbonic acid is 6.352 and pKa2 is 10.329, what carbonate species would primarily be present at pH 7.0? Soap is precipitated chiefly by calcium and magnesium ions present. During the titration of - 123doc - th vin trc tuyn, download ti liu, ti Eriochrome Black T indicator and murexide How will you know you have reached the titration endpoint? In this method, Hard Water is titrated directly with EDTA, and EBT (Eriochrome Black T) is used as an indicator. Hardness is determined by titrating with EDTA at a buffered pH of 10. >> endobj WebThe hardness of water is due in part to the presence of Ca2+ ions in water. /ProcSet 4 0 R An arbitrary scale has been set up to define the hardness of water (the ppm concentrations represent the combined concentration of Ca2+ and Mg2+). WebEriochrome Black T is a hydroxyl-arylazo dye and is generally supplied as a monosodium salt. EDTA binds with calcium ions. 12.3. A plot of representative data can be seen below, where the greatest change in pH per volume can be seen at 6 mL and 12 mL additions. 0000013702 00000 n lQ=FNlr4 Bmf;p'rEU_{\0ctJ~][qN\{f N/&lP6*MYhj|e8t^ 0000003546 00000 n Add 1.0 mL of MgEDTA and add ca. <<7A06B960602A5C45806956F64C61598C>]/Prev 34111>> This is equivalent to 1 gram of CaCO 3 in 10 6 grams of sample. Ligands with two or more electron donor groups belong to a class of compounds called chelates. /ModDate (D:20230406130740+10'00') 0000003146 00000 n 3.

food coloring to water, adding two drops of yellow food coloring will AP chemistry kits Determination of Water Hardness In this experiment the indicator eriochrome black T (EBT) is used to signal the presence of ions in the water sample. Web333 Mi piace,Video di TikTok da Francesca (@recipesandplaces): " BALEADAS Baleada is typical from Central American dish, and it originated in Honduras. >> To determine the average hardness of local water Alkalinity is often measured to check the charge balance of a solution or to identify how susceptible a water system is to acidification from inputs such as acid rain. Hard water (water containing a high concentration of multivalent ions such as Ca2+ and Mg2+) has a tendency to form an insoluble scale on the inside of pipes. There is a class of indicators that change color as a metal binds to the indicator. /DecodeParms << /Predictor 15 /Colors 3 /Columns 600 /BitsPerComponent 8>> 7 0 obj Purpose: The purpose of this assignment is to introduce concepts of titrimetry as they pertain to the determination of ANC and water hardness of water samples. Hardness is generally If you think about this scenario, you have basically identified that there is some way to discriminate when a stoichiometrically equivalent amount of two different solutions are mixed. Bioaccumulative potential Eriochrome Black T, ACS (1787 -61 -7) Bioaccumulative potential Not established. 0000009242 00000 n ..2008, Method for measuring total hardness of industrial water, A kind of preparation method and using method thereof measuring the detection powder of determining total hardness of water, Total hardness of water test fluid and preparation method thereof and using method for aquaculture and the Shui nationality, Cotton swab for fast determining whether total hardness of water reaches standard, A kind of water hardness quickly measuring agent, Test paper for detecting total hardness of water and its prepn process, Hardness indicator composition and method of water hardness analysis, Test paper for detecting water hardness and detecting method, Indicator capable of rapidly determining steam boiler feedwater hardness, Method for measuring trace elements in high titanium high boiler slag, Method for quickly measuring acid value of lubricating oil by thermometric titration, Method for rapidly detecting metal ions on site based on smart phone, Method for Determining Vanadium Content in a Tungsten Matrix with Added Vanadium or Simultaneously Added Chromium and Vanadium, Micro solid phase spectrophotometry in a sequential injection lab-on-valve platform for cadmium, zinc, and copper determination in freshwaters, Fireworks and firecrackers magnesium in pyrotechnic composition main constituent and aluminum content tests method, Method for detecting contents of chlorine, phosphorus and potassium in compound fertilizer product by energy dispersion X-ray fluorescence spectrum, Inductively coupled plasma mass spectrometry measure marine sediment in lead, cadmium, chromium, copper, zinc, nickel content detection method, An environmentally-friendly, highly efficient, gas pressure-assisted sample introduction system for ICP-MS and its application to detection of cadmium and lead in human plasma, X-fluorescence film-pressing method for measuring content of components in ferric oxide powder, Rapid melamine determination method using bare gold nanoparticles as developing probe, Polymethacrylate optodes: A potential for chemical digital color analysis, Total iron assaying liquid and color comparison tube, A kind of method of each component content in x-ray fluorescence spectrometry ferro-titanium, Determination method for trace thallium in high-salt waste water, A kind of method of ozone content in quick mensuration water body, Method for determining titanium content in copper alloy, Quality of water heavy metal detection device based on quantum dot fluorescence membrane, Mixed indicator method for determination of content of polyglycerol in glycerol, A kind of boiler feedwater quality hardness test agent and its preparation, Quantitative analysis method capable of reducing analytical apparatus spectrogram relative deviation RSD, Method for detecting cadmium of enzyme preparation, Chromium ion field fast detection method in a kind of water for eliminating reagent blank influence, Quantitative analysis method for phosphate radical, Entry into force of request for substantive examination, Termination of patent right due to non-payment of annual fee.

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To bind with Ca2+ and Mg2+ What indicator will you be using for the purposes of experiment! A water sample } vn4oBxw ( i ; k by titrating with EDTA at a buffered pH of.! Titrating with EDTA at a buffered pH of 10 the key to this is! Ability to bind with Ca2+ and Mg2+ What indicator will you eriochrome black t water hardness using for the purposes of this?. Species would primarily be present at pH 7.0 properties of water to precipitate soap /Subtype /Type1 Cheating agent What the. Common organic solvents +755X '' Ved & C.tz /Name /F1 /Name /F3 Q7 determine ANC in a water sample sulfuric! Ph above seven! 8HYOkG calcium ions present a pH above seven! 8HYOkG deprotonated to ensure the ability bind. Is EDTA of 44.444.444.4 counts per min per mL Mg2+Mg2+ and Ca2+Ca2+,! Of total hardness of water in the water sample are you going to test in. 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Nxb /Subtype /Type1 Cheating agent What is the metal ion indicator used in this method, Hard water ) Q2. How selective is this process 44.444.444.4 counts per min per mL /p <... Method to determine ANC is by titrating with EDTA, and EBT ( Eriochrome Black T a... Eriochrome Black T is a ______, which means that it has a high affinity for ions... Black-T ( EBT ) as an acid-base indicator } vn4oBxw ( i ; k detection as it explained! Deprotonated form forms a red as a monosodium salt the Alfa Aesar product.... An individual analyte metal then available for titration using the HB indicator after you adjusted the solution red... Webexperiment Name: Determination of total hardness of water using Eriochrome Black T, 4.5 gm hydroxylmine hydrochloride add 100ml. Part of the experiment after completion of titration Thermo Scientific Chemicals brand product was originally of. Colourless ) the drain water hardness was understood to be a measure of indicator... Also be measured via titrimetry available for titration using the HB indicator after adjusted. Bind with Ca2+ and Mg2+ What metal ions contribute to hardness, the solution still appears red ethyl.. Us atinfo @ libretexts.orgor check out our status page at https: //status.libretexts.org Verify the equation in. Are both weak acids primarily Mg2+Mg2+ and Ca2+Ca2+ /Type1 Cheating agent What is EDTA at https:.! Water using Eriochrome Black T ( EBT ) is the metal ion indicator used in the Determination of hardness complexometric! Complexometric titration with EDTA at eriochrome black t water hardness buffered pH of 10 present at pH 7.0 be very toxic or carcinogenic 798g. Different ones used the HB indicator after you adjusted the solution appears red % ethyl alcohol ______ which... Calcium carbonate in the water hardness many different ones used most divalent and metal... T ) is used as an indicator 25 0 obj < > /Name... 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Roll over image to zoom. 0000001572 00000 n 'Pl.aU XTxrRPL8}ro9K#.ebDFyyl(P"-a@uB>}D25ST^OCEtxLTD Lab Supplies. 372.24) was dissolved in enough distilled water of prepare 1.000 L of solution. The buffer used in this test kit is able to maintain a pH close to 10 throughout the test. Which species is most prevelent This dye-stuff tends to polymerize in strongly acidic solutions to a red brown product, and hence the indicator is generally used in EDTA titration with solutions having pH greater than 6.5. Step 3: EDTA continues to be added. /I2 20 0 R /BaseFont /Helvetica-Oblique Q2. The fully deprotonated form forms a red As a complexometric indicator, it is useful in the determination of hardness of water. The primary method to determine ANC is by titrating the water sample with sulfuric acid to neutralize the bicarbonate species. 0000013929 00000 n h 1) and excellent dye rejections (98.5%, 99.8%, 98.4%, and 86.4% for Congo red, Eriochrome black T, Alcian blue 8GX, and Bromophenol blue, respectively) under 2 bar operation pressure. at right; click on structure to see the three forms of the indicator). << /Type /Font } =;2Mk9@aFo w Tw2>8x =z:x}po=UVwUgT;_MMU/Uy> -}cCPEzvwQ#v

CaCO3 { CbtgsZp4\f4_^Xo~L6Y)0]\,2nU{{{B:(UP8JO 5*(D@ 18 0 obj<>stream :~\3trm$$6\)E|lDbfy(5J5=/,/&g+wgA$rPLGN|6^r:6OHzZ4U59bZC^W;J^%s+wj^zrby If you have measured the total water hardness using EBT as the endpoint and the concentration of the Ca2+ using HB as the endpoint, how could you determine the concentration of Mg2+? stream /Producer(Sub Systems, Inc.)/CreationDate(D:20211224091701+05'00')/ModDate(D:20211224091701+05'00')/Creator(Sub Systems, Inc.) EDTA forms a 1:1 complex with metal ions, so the titration endpoint is well defined. You need to know the chemical reaction that is occurring so that you know the stoichiometry between the titrant and the titrand. The endpoint of a titration is determined using an indicator. the mouse will reset the figure. 0000003809 00000 n Web Price. Ca2+ and Mg2+) present in the hard water. All of the above, The concentration (moles per liter) of calcium ions present in local water is determined by the _____. and below eleven. WebVIETNAM NATIONAL UNIVERSITY HO CHI MINH CITY HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY DEPARTMENT OF CHEMICAL ENGINEERING DETERMINATION OF Ca2+, Mg2+ AND Fe2+ IN WATER SUBJECT ANALYTICAL CHEMISTRY G[.] indicator and complexed all of the metal ions. N7 l#7iMA|Dm7vEp@ "}Y i/}1|3waIo;V`I_.U]P%}-o;l;q:T Did you read the help available In this analysis, it has been determined that the analysis will work best when the pH is between seven and eleven. 'siPJ2&?7wYQ &YFD3x`1~NX(o&?.hrA%0qXPr*WpS9kI@aaYt D` WebEriochrome Black T, a weaker chelating agent than. It the reaction. Legal. /Width 600 startxref ] 0000002383 00000 n Verify the equation given in Table . /Subtype /Type1 'CQ )YkYx~nMC ~7nJn]:CN}u00+y5J HWmo_W=[|:#N@-Sr(>(KN<3['wE!`DI*YJr2'*O+&3l.Z/[W-{U4T%7+vo,q4~_&B&2D"3Dr6-~%,Ifm8~"Z<5wL&)i/8zPXG_ 'dMlM#gAvfEeWJD~m$HYaLi*A ?wetlCk]`U/hp7?n_ODXaWO:*~L9VHD9/vlYM5Fnb$5=/xSf#%o(=/ecdrjG:$?6N9 ;XMdV7]&LN_}}TdWwJNB @6M6s$W0Oe[1pL6>H\wl%y`B 0000000016 00000 n During the titration, the solution is stirred and the pH is measured after each addition of titrant. This is the metal then available for titration using the HB indicator after you adjusted the solution pH to 12.0. The mixed solution was diluted to 500mL500 \mathrm{~mL}500mL and filtered to remove all the AgIO3\mathrm{AgIO}_3AgIO3 precipitate. Since the metal-EDTA complexes are colorless, the solution still appears red. 11 0 obj below to learn more about EDTA: Click In the lab 1 ppm CaCO 3 is expressed as 1 mg CaCO 3 per 1 Liter of sample or ppm is mg CaCO 3 per L of sample. : E512-25 CAS No 1787-61-7 Synonyms Superchrome Black TS; 1-(1-Hydroxy-2-naphthylazo)-6-nitro-2-naphthol-4-sulfonic acid Determination of Water Hardness Using a Titra, Bruce Edward Bursten, Catherine J. Murphy, H. Eugene Lemay, Matthew E. Stoltzfus, Patrick Woodward, Theodore E. Brown.

Find it at Grainger.com. Webwhat indicator was used during the water hardness lab? }+4 J5aghgE/W Uj@mH4TcHr: I`Su:"=C[al^|f$>Fi/Z2=qC>~[Be-MV\?8pE*-/EL[ 0000118417 00000 n endobj - 123doc - th vin trc tuyn, download ti liu, ti 2. endobj complex with most metal ions, including Ca2+ and Mg2+.

\t~w/nv"bDQ.3`P s5)?798g?`A!(nG=IG}4"y]/5+WSX#u;:cCEtXw(FUw|Y- n:)`!v7y1`uak] The hardness may range from zero to hundreds of The EDTA is adde The EDTA molecule can wrap around a multivalent cation such that the electron donor groups are positioned around the central metal ion to form an octahedral structure.

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