Question

1.5 g of CaCO3 was dissolved in dil. HCl and diluted to 1000 ml of water. 100 ml of this solution required 25 ml of EDTA solution for titration. 50 ml of a hard water sample required 23 ml of same EDTA solution. 50ml of the same sample after boiling and filtration required 12 ml of EDTA solution. Calculate the Total hardness, CH and NCH in ppm.

Answer 1

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Explanation: