HA is a weak acid. its pKa is 4.80. The pKb of a weak base, BOH is 4.78. Find the pH of an aqueous solution of the salt, BA .

Question

HA is a weak acid. its pKa is 4.80. The pKb of a weak base, BOH is 4.78. Find the pH of an aqueous solution of the salt, BA . (A) 9.22 (B) 9.58 (C) 4.79 (D) 7.01

Tardigrade Admin · Accepted Answer

Given that pKa=4.80 and pKb=4.78 pH=7+(1/2)(p Ka - p Kb) =7+(1/2)(4.80 - 4.78)=7.01

Q. $H A$ is a weak acid. its $p K_{a}$ is $4.80.$ The $p K_{b}$ of a weak base, $BO H$ is $4.78.$ Find the $p H$ of an aqueous solution of the salt, $B A$ .

$9.22$

$9.58$

$4.79$

$7.01$

Given that $p K_{a} = 4.80$ and $p K_{b} = 4.78$
$p H = 7 + \frac{1}{2} (p K_{a} - p K_{b})$
$= 7 + \frac{1}{2} (4.80 - 4.78) = 7.01$

Q. HA is a weak acid. its pKa​ is 4.80. The pKb​ of a weak base, BOH is 4.78. Find the pH of an aqueous solution of the salt, BA .

9.22

9.58

4.79

7.01