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The solubility of a substance is defined as the amount of solute in grams:

1. present in 100 g of the solvent
2. present in 100 g of the solution
3. present in \( 100 \mathrm{mL} \) of the solution
4. present in 1 litre of the solution

Correct answer: present in 100 g of the solution

Solution

Solubility is commonly expressed as the mass of solute that dissolves in 100 g of solution. This makes it a mass-based concentration measure, so the correct choice is the one referring to 100 g of the solution.

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