Question

Which of the following is $TRUE$:

• A. $\frac{Q}{K_{sp}}>1\Rightarrow$ The solution is unsaturated.
• B. $\frac{Q}{K_{sp}}<1\Rightarrow$ The solution is saturated.
• C. $\frac{Q}{K_{sp}}=1\Rightarrow$ The solution is saturated.
• D. Both b and c

Answer 1

The correct option is C $\frac{Q}{K_{sp}}=1\Rightarrow$ The solution is saturated.

We know,
$Q<K_{sp}\Rightarrow \frac{Q}{K_{sp}}<1\Rightarrow$ the solution is unsaturated, and more of the ionic solid, if available, will dissolve.

$Q=K_{sp}\Rightarrow \frac{Q}{K_{sp}}=1\Rightarrow$the solution is saturated and at equilibrium.

$Q>K_{sp}\Rightarrow \frac{Q}{K_{sp}}>1\Rightarrow$the solution is supersaturated, and ionic solid will precipitate.

From these we can clearly see (c) is the correct answer.