Answer Posted / yogesh

hardness means presence of Calcium and Magnesium carbonates
and bicarbonates, these can be analysed by titration with
EDTA ( Ethylene Diamino tetra acetic acid ) using muroxide
and Eriochrome black-T as indicators

For calcium hardness muroxide is the indicator colour
change is pink to violet ( brinjal flower colour)

For total hardness determination EBT is the indicator
colour cange is pink to blue

other methods are also.....

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