Question

Determination of hardness of water by edta method calculations

Answer 1

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Answer 2

Answer:

Calculations

1. Standardization of EDTA

M1V1 = M2V2

Where, M1 = Molarity of standard hard water

V1 = Volume of standard hard water in conical flask

M2 = Molarity of EDTA

V2 = Volume of EDTA consumed (burette reading)

2. Determination of Total hardness

M2V2 = M3V3

Where, M3 = Total hardness of sample water

V1 = Volume of sample hard water in conical flask

3. Determination of Permanent hardness

M2V2 = M4V4

Where, M4= Permanent hardness of sample water

V4 = Volume of sample hard water in conical flask

Note: Multiply M3 and M4 with 105

to covert hardness into parts per million (ppm).

4. Determination of Temporary hardness

Temporary hardness = Total hardness – Permanent hardness

Hope it helps u

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