What is the [A−]/[HA] ratio when the weak acid is in a solution one pH unit above its pK_a? A) 1:1 B) 1:10 C) 10:1 D) 2:1 E) None of the above.

Question

Quizplus · Accepted Answer

When the pH of the solution is one unit above the pKa of a weak acid, the [A−]/[HA] ratio is 10:1. This is because for each unit of pH above the pKa, the concentration of deprotonated form ([A−]) increases tenfold compared to the protonated form ([HA]).

What Is the [A−]/[HA] Ratio When the Weak Acid Is