A student has access to 0.10 M aqueous solutions of the three substances listed below…
CHEMISTRY · Multi-part · A Level · Chemistry · Acids and bases · Acids and bases
Problem
A student has access to 0.10 M aqueous solutions of the three substances listed below at 25 °C.
• Substance A: pKb=3.72
• Substance B: pKb=5.11
• Substance C: a weak monoprotic acid with pKa=9.24
The student wishes to know which solution will be the most basic.
(a) Convert the numerical data for Substance C into a value that is directly comparable with the information given for Substances A and B.
(b) Using appropriate quantitative reasoning, rank the three substances in order of decreasing basicity of their 0.10 M solutions (most basic to least basic).
(c) Identify which solution will have the highest equilibrium concentration of OH−. Support your answer with a brief justification.