First slide

PH of strong acids and strong bases

Question

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

Moderate

A

49 L
B

9 L
C

79 L
D

59 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 to be added = 10-1 = 9L

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