Compound 'R' has a solubility of 25g per 100g of water at 30°C. A solution is prepared by dissolving 20g of compound 'R' in 80g of water at 30°C. Which of the following best descri... Compound 'R' has a solubility of 25g per 100g of water at 30°C. A solution is prepared by dissolving 20g of compound 'R' in 80g of water at 30°C. Which of the following best describes the resulting solution?
Understand the Problem
The question wants us to determine the saturation state of a solution of compound 'R' in water at a given temperature based on its solubility. We need to calculate the maximum amount of 'R' that can dissolve in 80g of water and compare it to the actual amount dissolved to determine if the solution is unsaturated, saturated, or supersaturated.
Answer
The resulting solution is unsaturated.
The resulting solution is unsaturated because it contains less solute (20g) than the maximum solubility (25g) in the given amount of solvent (80g water).
Answer for screen readers
The resulting solution is unsaturated because it contains less solute (20g) than the maximum solubility (25g) in the given amount of solvent (80g water).
More Information
A solution is unsaturated if it contains less solute than the maximum amount that can be dissolved in a solvent at a given temperature. If the solution contained exactly 25g of compound R per 100g of water, it would be saturated. If it contained more, it would be supersaturated.
Tips
A common mistake is to not scale the solubility correctly, since the problem provides the solubility per 100g of water, but the solution uses 80g of water.
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