Which of the following acids would you use to make an effective buffer for a reaction at pH 8? A) Ethanoic acid; K_a = 1.7 *10^-5 B) Diphosphoric acid; K_a = 1.4* 10^-7 C) Tris-hydroxmethylaminoethane; K_a = 8.3 *10^-9 D) Ammonium chloride; K_a = 5.6 *10^-10 E) Sodium bicarbonate; K_a = 5.3 * 10^-11

Question

Quizplus · Accepted Answer

A buffer is most effective when the pH is close to the pKa of the acid. Tris-hydroxmethylaminoethane has a pKa close to 8, making it suitable for buffering at pH 8.

Which of the Following Acids Would You Use to Make