Chapter 16, Problem 10STP

Interpretation Introduction

Interpretation : Action is to be taken that will cause more sugar to dissolve in the saturated solution.

Concept Introduction : A solution of the highest concentration of the solute that can be dissolved in a fixed amount of solvent at a particular temperature and pressure is known as a saturated solution.

Answer to Problem 10STP

(B) II only.

Explanation of Solution

The saturated solution already contains the maximum concentration of solute so, no more solute will be dissolved in the solution. Some factors affect the solubility of the solute in the saturated solution. These factors are as follows:

1. Temperature: On increasing the temperature the solubility of the solute can be increased in the saturated solution. It affects the solubility of solids, liquids, and gases.
2. Pressure: On increasing the pressure the solubility of the solute can be increased in the saturated solution. It mainly affects the solubility of gases.

Hence, the Heating of the solution increases the temperature and on adding sugar, it will get dissolved in the saturated solution.

Conclusion

Reasons for incorrect options:

• The option states that if sugar is added while stirring it will be soluble but, that is not possible as the solution is saturated and no more solute will get dissolved. 
• The third option is incorrect as it states that adding the powdered form of sugar while stirring will increase the solubility of the sugar in the saturated solution. But that is not possible as the solution already reached its saturation point and the addition of solute in any form will not increase its solubility.