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Question

Chemistry Question on Equilibrium

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

A

0.11

B

0.91

C

2.01

D

9.01

Answer

9.01

Explanation

Solution

pH=1∴[H+]=10−1=0.1pH = 1 \therefore [ H^+ ] = 10^{ - 1 } = 0.1 M
\hspace20mm p H = 2 ∴[H+]=10−2=0.01\therefore [ H^+ ] = 10^{ - 2 } = 0.01 M
For dilution of HCl, M1V1=M2V2M _1 V_1 = M_2 V_2
\hspace20mm 0.1×1=0.01×V2 0.1 \times 1 = 0.01 \times V_2
\hspace20mm V2=10 V_2 = 10 L
Volume of water to be added = 10 - 1 = 9 L