Question

Sugar dissolves faster on stirring with a spoon. Which of the following is the best reason to explain this?

• A. Mechanical stirring decreases solubility.
• B. Mechanical stirring increases solubility.
• C. Stirring has nothing to do with solubility.
• D. The solution becomes unsaturated if it is stirred.

Answer 1

The correct option is B

Mechanical stirring increases solubility.

Stirring affects the rate of dissolving because it spreads the solvent's molecules around the solute and increases the chance of them coming into contact with each other faster. As a result, mechanical stirring increases solubility of the solute in the solvent. Hence, sugar dissolves faster in water when stirred with a spoon.