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Question: A 50 ml solution of pH = 1 is mixed with a 50 ml solution of pH = 2. The pH of the mixture will be n...

A 50 ml solution of pH = 1 is mixed with a 50 ml solution of pH = 2. The pH of the mixture will be nearly –

A

0.76

B

1.26

C

1.76

D

2.26

Answer

1.26

Explanation

Solution

pH = 1 means [H+] = 10–1 M. pH = 2 means [H+] = 10–2 M. After mixing, total [H+]

= (10–1 + 10–2)/2 =0.112\frac{0.11}{2}= 0.055

= 5.5 × 10–2. pH = 2 – log5.5

= 2 – 0.74 = 1.26 .