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Question: Solution of a monobasic acid has a pH = 5. If one mL of it is diluted to 1 litre, what will be the p...

Solution of a monobasic acid has a pH = 5. If one mL of it is diluted to 1 litre, what will be the pH of the resulting solution?

A

KcK_{c}

B

Qc<Kc′Q_{c} < K_{c'}

C

Qc<Kc′Q_{c} < K_{c'}

D

Qc<Kc′Q_{c} < K_{c'}

Answer

Qc<Kc′Q_{c} < K_{c'}

Explanation

Solution

: pH=5,[H+]=10−5MpH = 5,\lbrack H^{+}\rbrack = 10^{- 5}M

After dilution =10−51000=10−8M= \frac{10^{- 5}}{1000} = 10^{- 8}M

Total [H+]=10−8+10−7=1.1×10−7\lbrack H^{+}\rbrack = 10^{- 8} + 10^{- 7} = 1.1 \times 10^{- 7}

pH=−log⁡[H+]=−log⁡(1.1×10−7)=6.96pH = - \log{}\lbrack H^{+}\rbrack = - \log\left( 1.1 \times 10^{- 7} \right) = 6.96