Why is back titration used?
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Back titration is used in volumetric analysis to find out excess of reagent added by titrating it with suitable reagent. It is also used to find out percentage purity of sample.
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A back titration is used when the molar concentration of an excess reactant is known, but the need exists to determine the strength or concentration of an analyte. ... When direct titration endpoint would be hard to discern (e.g., weak acid and weak base titration) When the reaction occurs very slowly
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