The of a weak monoprotic acid is and the of a weak base is . What will be the precise pH of an aqueo — Ionic Equilibrium Chemistry Question
Question
The $pK_a$ of a weak monoprotic acid $HA$ is $4.80$ and the $pK_b$ of a weak base $BOH$ is $4.78$. What will be the precise pH of an aqueous solution of the corresponding salt $BA$?
Answer: C
💡 Solution & Explanation
The salt $BA$ is formed from a weak acid and a weak base. The pH of its aqueous solution is given by the formula $pH = 7 + \frac{1}{2}(pK_a - pK_b)$. Substituting the given values, $pH = 7 + \frac{1}{2}(4.80 - 4.78) = 7 + \frac{1}{2}(0.02) = 7 + 0.01 = 7.01$.
💬Ask on WhatsApp →
Still have doubts about this question?
Send it to our AI chemistry tutor on WhatsApp — gets answered in minutes