CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases
Problem
At 50 °C the ion-product constant of water is Kw=5.5×10−14. The weak acid HQ has pKa=9.30 (assumed temperature-independent). A 0.40M aqueous solution of its conjugate base Q⁻ is prepared at 50 °C. What is the percent ionization of Q⁻ in this solution?
(a) 0.71 \%
(b) 3.3 \%
(c) 1.7 \%
(d) 0.017 \%