for at a certain temperature is . The pH of a basic buffer containing equimolar concentrations of an β Ionic Equilibrium Chemistry Question
Question
$pK_b$ for $NH_4OH$ at a certain temperature is $4.74$. The pH of a basic buffer containing equimolar concentrations of $NH_4OH$ and $NH_4Cl$ will be:
Answer: D
π‘ Solution & Explanation
For a basic buffer, $pOH = pK_b + \log\frac{[Salt]}{[Base]}$. Since the concentrations of salt and base are equimolar, the log term becomes $\log(1) = 0$. Thus, $pOH = pK_b = 4.74$. The pH of the solution is $14 - pOH = 14 - 4.74 = 9.26$.
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