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At 25 degrees Celsius, 36 g of sodium chloride dissolves fully in 100 g of water to give a saturated solution. What is a solution containing 40 g of NaCl in 100 g of water at the same temperature?
AAn unsaturated solution
BA supersaturated solution
CA saturated solution
DA dilute solution
Answer & Solution
Correct answer: B. A supersaturated solution
1. The saturation limit at 25 degrees Celsius is 36 g of NaCl per 100 g of water.
2. The given solution holds 40 g, which is more than the saturation limit of 36 g.
3. A solution that contains more solute than the saturated value is supersaturated; it is not merely unsaturated, which would need less than 36 g.
4. Therefore 40 g of NaCl in 100 g of water at 25 degrees Celsius is supersaturated.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 9 Solutions "Types of Solutions", p.134_
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