Answer:
3. A
In most cases, only a certain maximum amount of solute can be dissolved in a given amount of solvent. This maximum amount is called the solubility of the solute. It is usually expressed in terms of the amount of solute that can dissolve in 100 g of the solvent at a given temperature.
4. D
Saturated solutions have dissolved the maximum amount of solute possible at a given temperature. This is defines the solubility of the solute in the solvent. Supersaturated solutions contain more solute than is present in a saturated.
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