Dissociation constants of CH3COOH and NH4OH in aqueous solution are 10-5. If pH of a CH3COOH solution is 3, What will be the pH of NH4OH?

Question

Dissociation constants of CH3COOH and NH4OH in aqueous solution are 10-5. If pH of a CH3COOH solution is 3, What will be the pH of NH4OH? (A) 3.0 (B) 4.0 (C) 10.0 (D) 11.0

Tardigrade Admin · Accepted Answer

pH of CH3COOH = 3 [H+]=10-3 M from CH3COOH [NH4OH]=[CH3COOH]=10-3 M [OH-]=10-3 M [H+][OH-]=10-14 [H+]=(10-14/10-3)=10-11 pH of NH4OH=-log (10-11) =11

Q. Dissociation constants of $C H_{3} COO H$ and $N H_{4} O H$ in aqueous solution are $1 0^{- 5}$ . If $p H$ of a $C H_{3} COO H$ solution is $3$ , What will be the $p H$ of $N H_{4} O H$ ?

$3.0$

$4.0$

$10.0$

$11.0$

$p H$ of $C H_{3} COO H = 3$
$[H^{+}] = 1 0^{- 3} M$ from $C H_{3} COO H$
$[N H_{4} O H] = [C H_{3} COO H] = 1 0^{- 3} M$
$[O H^{-}] = 1 0^{- 3} M$
$[H^{+}] [O H^{-}] = 1 0^{- 14}$
$[H^{+}] = \frac{1 0 ^{- 14}}{1 0 ^{- 3}} = 1 0^{- 11}$
$p H$ of $N H_{4} O H = - l o g (1 0^{- 11})$
$= 11$

Q. Dissociation constants of CH3​COOH and NH4​OH in aqueous solution are 10−5. If pH of a CH3​COOH solution is 3, What will be the pH of NH4​OH?

3.0

4.0

10.0

11.0