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JEE Main 20137 April

Exam: JEE Main
Year: 2013
Date: 7 April
Subject: Chemistry
Chapter: Some Basic Concepts of Chemistry

JEE Main 2013 · 7 April · Chemistry · Some Basic Concepts of Chemistry

How many litres of water must be added to 1 litre of aqueous...

How many litres of water must be added to

1

litre of aqueous solution of

HCl

with a pH of

1

to create an aqueous solution with pH of

2

?

Options

A $2 . 0$
B $9 . 0$
C $0 . 1$
D $0 . 9$

Correct answer

B. $9 . 0$

Step-by-step solution

pH = 1 = - log [ {H}^{+} ]

[ {H}^{+} ] = {10}^{- 1}M

FinalpH = 2; [ {H}^{+} ] = {10}^{- 2}M

{M}_{1}{V}_{1} = {M}_{2}{V}_{2}

( 0 . 1M \times 1Litre ) = ( 0 . 01 ) {V}_{2}

{V}_{2} = 10L

Final volume

= 10L

Water added

= 10 - 1 = 9L

.

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