Equilibrium Question 385
Question: 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 [BHU 2005]
Options:
A) 3.2
B) 1.9
C) 3.4
D) 3.5
Show Answer
Answer:
Correct Answer: B
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
