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?

Question

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) 3.45 (B) 6.96 (C) 8.58 (D) 10.25

Tardigrade Admin · Accepted Answer

pH=5, [H+]=10-5 M After dilution =(10-5/1000)=10-8 M Total [H+]=10-8+10-7=1.1×10-7 pH=-log[H+] =-log (1.1×10-7) =6.96

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

$3.45$

$6.96$

$8.58$

$10.25$

$p H = 5$ , $[H^{+}] = 1 0^{- 5} M$
After dilution $= \frac{1 0 ^{- 5}}{1000} = 1 0^{- 8} M$
Total $[H^{+}] = 1 0^{- 8} + 1 0^{- 7} = 1.1 \times 1 0^{- 7}$
$p H = - l o g [H^{+}]$
$= - l o g (1.1 \times 1 0^{- 7})$
$= 6.96$

Q. 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?

3.45

6.96

8.58

10.25