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Solubility

AP Chemistry· difficulty 3/5

Solubility of KNO₃ at 50 °C is 86 g/100 g; at 20 °C is 32 g/100 g.

50 °C: 86 g/100g 20 °C: 32 g/100g 100 g of saturated soln cooled 50→20 °C

How much KNO₃ crystallizes from a 100 g saturated solution at 50 °C cooled to 20 °C? (assume 100 g solvent throughout)

  • A

    86 g

  • B

    118 g

  • C

    32 g

  • D

    54 g

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Explanation

Solubility drops 86 → 32 g per 100 g water. Excess = 86 − 32 = 54 g crystallizes.

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