IB Chemistry home > Syllabus 2016 > Stoichiometry > The aqueous state

Syllabus ref: 1.3

Some solids can mix so intimately with water (or other liquids) that they seem to have disappeared. This process is called dissolution. The liquid phase is called the solvent and the solid phase that dissolves is termed the solute.

The majority of solutions are aqueous, i.e. they involve water as the solvent phase. This is usually indicated by the state symbol (aq) appearing as a subscript after the compound name or formula.


The molar concentration of a solution is determined by the amount of solute and the volume of solution.

A standard solution is one of known concentration.

Applications and skills

Solution of problems involving molar concentration, amount of solute and volume of solution.

Use of the experimental method of titration to calculate the concentration of a solution by reference to a standard solution.

In Chapter 3.5