Buffer systems are effective when the pH values are within ____ pH unit(s) of the pK_a value.

Question

Quizplus · Accepted Answer

Buffer systems are most effective when the pH values are within one pH unit of the pK value of the weak acid or weak base in the buffer. This is because at the pK value, the concentrations of the acid and its conjugate base are equal, allowing for maximum buffering capacity. If the pH deviates more than one unit away from the pK value, the concentration of the buffer components become unequal, reducing buffering capacity.

Buffer Systems Are Effective When the PH Values Are Within