Question: Which indicator is commonly used in the EDTA titration method for water hardness estimation? a ) Phenolphthalein b ) Methyl orange c ) Bromothymol blue

Which indicator is commonly used in the EDTA titration method for water hardness estimation?
a) Phenolphthalein
b) Methyl orange
c) Bromothymol blue
d) Eriochrome black T

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