For an aqueous solution containing a weak base and its completely soluble salt (where is derived fro — Ionic Equilibrium Chemistry Question
Question
For an aqueous solution containing a weak base $BOH$ and its completely soluble salt $BA$ (where $A^-$ is derived from a strong acid), which of the following are true consequences of the common ion effect?
Answer: A,B,C
💡 Solution & Explanation
The strong salt $BA$ completely dissociates to give $B^+$, which acts as a common ion. The high $[B^+]$ shifts the $BOH \rightleftharpoons B^+ + OH^-$ equilibrium strongly backward. This reduces the degree of dissociation and lowers the equilibrium $[OH^-]$. A lower $[OH^-]$ directly corresponds to a higher $pOH$.
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