Buffer capacity is maximum when:
ApH = pKa (equal acid and salt concentrations)
BpH > pKa
CpH < pKa
DpH = 7
Answer & Solution
Correct answer: A. pH = pKa (equal acid and salt concentrations)
Buffer capacity is maximum when [salt] = [acid], which means pH = pKa. The buffer can neutralise added acid or base most effectively at this point.
Related questions
For the dissociation of a weak acid HA, the degree of dissociation α is given (approximateAccording to Brønsted-Lowry, an acid is a substance that:If Q (reaction quotient) > K_c at some instant, the reaction will:Le Chatelier's principle states that a system at equilibrium under stress:K_sp of a sparingly soluble salt AB at 25 °C is 4 × 10⁻¹⁰. Molar solubility s of AB is:A buffer solution is most resistant to pH change when:K_w (ionic product of water at 25 °C) is:The pH of a 0.01 M HCl solution is: