A solution is saturated in CO2 gas and KNO3 at room temperature. What happens when the solution is warmed to 75°C? solid KNO, precipitates out of the solution

gaseous CO2 bubbles out of the solution

solid KNO, precipitates out and gaseous CO2 bubbles out

nothing happens; both CO2 and KNO3 remain in solution

When the solution is warmed to 75°C ; ( B ) gaseous CO₂ bubbles out of the solution

When a solution is saturated with CO₂ ( gas ) and KNO₃ ( s ) has its temperature increased above the room temperature to about 75°C the solubility of the gas CO₂ will decrease, because the solubility of gas in a solution decreases with an increase in temperature while the solubility of a solid increases with increase in temperature.

Since the solubility of the gas decreases the gas will escape as bubbles ( CO₂ bubbles ).

Hence we can conclude that When the solution is warmed to 75°C ; ( B ) gaseous CO₂ bubbles out of the solution.

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gaseous CO2 bubbles out of the solution

Explanation:

We already know that the dissolution of a gas in water is exothermic. Hence, when the temperature of a solution containing a gas is increased, the solubility of the gas decreases and the gas bubbles out of the solution.

Similarly, the dissolution of KNO3 in water is endothermic. This implies that the solubility of the solid increases with increasing temperature.

Thus the solid becomes more soluble at 75°.

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