Question

In Estimation of hardness of water by EDTA method, Wine red colour indicates​

Answer 1

Answer:

EDTA can form four or six coordination bonds with a metal ion. Total hardness is due to the presence of bicarbonates, chlorides and sulphates of calcium and magnesium ions. ... Initially EBT forms a weak EBT- Ca2+/Mg2+ wine red coloured complex with Ca2+/Mg2+ ions present in the hard water