Chapter31: Introduction To Analytical Separations
Section: Chapter Questions
Problem 31.19QAP
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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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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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