A BUFFER solution is best described as:
AA weak acid + its salt (or weak base + its salt)
BA strong acid + strong base mixed together
CA very dilute strong acid
DAn acidic solution at extreme pH
Answer & Solution
Correct answer: A. A weak acid + its salt (or weak base + its salt)
Buffer = weak acid + conjugate base (its salt) OR weak base + its conjugate acid salt. The pair resists pH changes when small acid or base is added. Henderson equation: pH = pKa + log([salt]/[acid]).
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: