First slide

PH of strong acids and strong bases

Question

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 ?

Easy

A

0.1 L
B

0.9 L
C

2.0 L
D

9.0 L

Solution

pH = 1
$∴ [H^{+}] = 10^{- 1} = 0.1 M$
pH = 2
$∴ [H^{+}] = 10^{- 2} = 0.01 M$
For dilution of HCl,
$M_{1} V_{1} = M_{2} V_{2}$
$0.1 \times 1 = 0.01 \times V_{2}$
$V_{2} = 10 L$
Volume of water required = 10-1 = 9 lits

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