Question
Question: How many litres of water must be added to 1 litre an aqueous solution of HCl with a pH of 1 to creat...
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 ?
A
0.1 L
B
0.9 L
C
2.0 L
D
9.0 L
Answer
9.0 L
Explanation
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 lt
Volume of water added = 10–1 = 9 litre