75cc of water sample requires 10.2 cc of 0.01 M EDTA for titration in presence of eriochrome black T indicator. Calculate the total hardness.
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the total hardness of the given sample of water is 136 ppm
- The formula used to calculate the total hardness of a water sample by titrating it with EDTA solution in the presence of eriochrome black T indicator is :
Total hardness = (Volume of EDTA consumed × Molarity of EDTA × Molar mass of CaCO3 × 1000)/Volume of water sample
- putting the given values in the formula, we get
Total hardness = ( 10.2 × 0.01 × 100 × 1000)/75
= 10200/75
= 136 ppm
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