Equilibrium Question 489

Question: 10−6MHCl is diluted to 100 times. Its pH is [CPMT 1984]

Options:

A) 6.0

B) 8.0

C) 6.95

D) 9.5

Show Answer

Answer:

Correct Answer: C

Solution:

10−6,M,HCl=10−8M,[H+] . Also from H2O

[H+]=10−7M Total [H+]=10−7+10−8=10−7[1+0.1]

=10−7[1.1] Hence pH=7−0.0414=6.96 .

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