A visual graph plots the log of molar solubility () of a weak acid salt (like ) on the y-axis against the pH of the solution on the x-axis. As the pH drops strictly below the of , what visual trend do

Question

A visual graph plots the log of molar solubility ($\log S$) of a weak acid salt (like $AgCN$) on the y-axis against the pH of the solution on the x-axis. As the pH drops strictly below the $pK_a$ of $HCN$, what visual trend does the curve exhibit?

Prashant Kotian · Accepted Answer

Correct answer: B. For a salt of a weak acid, lower pH implies a higher concentration. The excess consumes the weak base anion () to form the weak acid (), dragging the dissolution equilibrium heavily forward. Thus, as the pH visually drops below the (into the highly acidic region), the solubility increases dramatically, causing the vs pH graph to visually display a sharp, linear upward slope.

💡 Solution & Explanation

Practice 22,000+ questions like this