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 ?
(1) 0.1 L
(2) 0.9 L
(3) 2.0 L
(4) 9.0 L
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The answer is option d 9 litres.
Explanation:
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Question:
How many litres of water must be added to 1 litre an aqueous solution of HCl with a pH of 1 to create an aqueous solution with pH of 2 ?
Solution:
pH = 1 ⇒ [H+] = 10–1 = 0.1 M
pH = 2 ⇒ [H+] = 10–2 = 0.01 M
for dilution of HCl,
M1V1 = M2V2
0.1 × 1 = 0.01 × V2
V2 = 10 L
Volume of water added = 10 – 1 = 9 litre
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