QJEEM13Ch605f: JEE Main 2013 Chemistry - Class 11 JEEM13Ch605f Solution: How many litres of water must be added to 1 litre of an aqueous …

Question

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How many litres of water must be added to 1 litre of an aqueous solution of HCl with a pH of 1 to create an aqueous solution with pH of 2?

Accepted Answer

As

p H = 1; H^{+} = 10^{- 1} = 0.1 M

p H = 2; H^{+} = 10^{- 2} = 0.01 M

∴

M_{1} = 0.1 V_{1} = 1;

M_{2} = 0.01 V_{2} = ?

From

M_{1} V_{1} = M_{2} V_{2}; 0.1 \times 1 = 0.01 \times V_{2}

V_{2} = 10

litre

∴

volume of water added

= 10 - 1 = 9

litre.

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