Question on: JAMB Chemistry - 2024
If the solubility of KNO3 at 30°C is 3.10 mol/dm3, a solution containing 303 g/dm3 KNO3 is likely to be:
A
saturated
B
unsaturated
C
supersaturated
D
at saturation point
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Correct Option: B
Determine the solution type:
- Molar mass of KNO3: 39.1 + 14 + 3×16 = 101.1 g/mol
- Solubility in g/dm³: 3.10 × 101.1 = 313.41 g/dm³
- Compare given concentration: 303 g/dm³ < 313.41 g/dm³
- Since the concentration is close to maximum, the solution is likely supersaturated, with potential precipitation of excess solute.
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