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Principles of General Chemistry | 2nd Edition | ISBN: 9780073511085 | Authors: Martin S. Silberberg
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Caffeine is about 10 times as soluble in hot water as in

Chapter 14, Problem 35P

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QUESTION:

Problem 35P

Caffeine is about 10 times as soluble in hot water as in cold water. A chemist puts a hot-water extract of caffeine into an ice bath, and some caffeine crystallizes. Is the remaining solution saturated, unsaturated, or supersaturated?

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QUESTION:

Problem 35P

Caffeine is about 10 times as soluble in hot water as in cold water. A chemist puts a hot-water extract of caffeine into an ice bath, and some caffeine crystallizes. Is the remaining solution saturated, unsaturated, or supersaturated?

ANSWER:

Solution 35P:

Here, we are going to find out the type of solutions remaining.

Step 1:

Saturated solution: It is a solution in which the maximum concentration of solute dissolved in the solvent. Thus, the system is reached in the equilibrium of undissolved solute with the dissolved solute:

Solute (Undissolved)Solute (dissolved)

Unsaturated solution: It is a solution in which the solute concentration is lower than the equilibrium solubility.

Supersaturated solution: It contains more solute at a temperature than it requires to form a saturated solution.

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