First slide

PH of strong acids and strong bases

Question

The pH of a solution is 11. It is diluted by 1000 times. Then the pH of resulting solution is

Moderate

A

8
B

14
C

7
D

7.04

Solution

P^H = 11 ⇒ P^OH = 3
[OH^-] = 10^-3
After dilution, concentration of [OH^-] becomes $\frac{10^{- 3}}{10^{3}} = 10^{- 6}$
P^OH = 6 ⇒ P^H = 8

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