Question

Estimation of hardness of Water by edta method is used to determine

Answer 1

Answer:

....(2)

cost value of left out plot = [ 1

Answer 2

Answer:

The hardness of water can be determined by complexometric titration using Ethylene diamine tetraacetic acid (EDTA). EDTA in the form of its di-sodium salt forms complex with Ca2+and Mg2+ ions of the water sample. When Eriochrome Black T (EBT) indicator is added to the hard water at pH around 9.10, it gives wine red coloured unstable complex with Ca2+and Mg2+ions of the water sample.