Question

Why is naoh added to a water sample for estimating calcium hardness separately

Answer 1

Calcium and magnesium salts dissolved in water cause water hardness. Water hardness can be measured using a titration with ethylenediaminetetraacetic acid (EDTA). The ionised form of EDTA is shown on the right. ... An indicator, known as a metal ion indicator, is required for the titration

Answer 2

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Calcium and magnesium ions dissolved in water cause water hardness. Ethylenediaminetetraacetic acid (EDTA), shown on the right in its deprotonated form, is commonly used in a titration to determine the concentration of Ca2+ and Mg2+ ions in water because both ions form complexes with EDTA.