Question
Question: Given pH of a solution A is 3 and it is mixed with another solution B having pH 2. If both mixed the...
Given pH of a solution A is 3 and it is mixed with another solution B having pH 2. If both mixed then resultant pH of the solution will be.
A
3.2
B
1.9
C
3.4
D
3.5
Answer
1.9
Explanation
Solution
pH of the solution A = 3
[H+]A = 10–3 M.
pH of the solution B = 2
[H+]B =10–2 M
[H+] = 10–3 + 10–2 = 10–3 + 10 × 10–3 = 11 × 10–3.
pH = – log(11 × 10–3) = 3 – log 11
= 3 – 1.04 = 1.95