Question

57. In the determination of hardness by EDTA method, 50 ml of standard hand
water (containing 1 mg of Caco, hardness per ml of solution) required
30 ml of EDTA solution while 50 mL of the sample of hard water consumed
20 ml of EDTA solution. After boiling 50 ml of the same sample required
10 ml of EDTA solution. Calculate the various hardnesses in ppm.​

Answer 1

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