Hydrochloric acid solutions A and B have concentrations 0.5 N and 0.1 N respectively. The volumes of solution A and solution B required to make a 2 litre solution of 0.2 N HCl are

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N A ​ V A ​ = N B ​ ( 2 − V A ​ ) = 2 × 0.2 0.5 ( V A ​ ) = 0.1 ( 2 − V A ​ ) = 0.4 0.4 V A ​ = 0.2 V A ​ = 0.5 Therefore, the volumes of the two solutions required are 0.5 L of A and 1.5 L of B.

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