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1.Write the equation for reaction between Mg2+ and EDTA (H2Y2 )                           2. Write the equation for reaction between Ca2+ and EDTA (H2Y2-)

1.Write the equation for reaction between Mg2+ and EDTA (H2Y2 )                           2. Write the equation for reaction between Ca2+ and EDTA (H2Y2-)

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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1.Write the equation for reaction between Mg2+ and EDTA (H2Y2 )                          

2. Write the equation for reaction between Ca2+ and EDTA (H2Y2-) 

 

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Classification Soft Moderately Hard Hard Very Hard mg/L or ppm 6. 7. 8. 0-60 61-120 121-180 > 180 PROCEDURE: 1. Dilute the EDTA solution by dispensing 25.0 ml of the given EDTA from a burette into a 250 ml volumetric flask and make up to the mark with distilled water. 2. Rinse and fill the burette with the diluted EDTA solution. 3. Dispense a 20 ml aliquot of the hard water sample into a 250 ml conical flask. Add 2 ml of buffer solution (pH 10). Add 4 drops of the Eriochrome black T indicator solution. 4. Repeat step (3) a further 3 times so that your have four conical flasks of the water solution for the repeat titrations. 5. Titrate the water sample with the EDTA solution until the colour changes from wine-red to pure blue. Repeat the titration until three (3) concordant results are obtained. Express the water hardness in mol L-1 of (Ca²+ + Mg²+). Assuming the water hardness is only due to the presence of Ca²+, express the water hardness in terms of mg L-1 of CaCO3.
Transcribed Image Text:Classification Soft Moderately Hard Hard Very Hard mg/L or ppm 6. 7. 8. 0-60 61-120 121-180 > 180 PROCEDURE: 1. Dilute the EDTA solution by dispensing 25.0 ml of the given EDTA from a burette into a 250 ml volumetric flask and make up to the mark with distilled water. 2. Rinse and fill the burette with the diluted EDTA solution. 3. Dispense a 20 ml aliquot of the hard water sample into a 250 ml conical flask. Add 2 ml of buffer solution (pH 10). Add 4 drops of the Eriochrome black T indicator solution. 4. Repeat step (3) a further 3 times so that your have four conical flasks of the water solution for the repeat titrations. 5. Titrate the water sample with the EDTA solution until the colour changes from wine-red to pure blue. Repeat the titration until three (3) concordant results are obtained. Express the water hardness in mol L-1 of (Ca²+ + Mg²+). Assuming the water hardness is only due to the presence of Ca²+, express the water hardness in terms of mg L-1 of CaCO3.
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