Acid: species that donates a proton in aqueous solution.

Accurate titration: carefully performed titration that is carried out after the rough titration is performed.

Alkali: species that accepts a proton in aqueous solution

Concordant titre: the volume of two or more titres that are similar in quantity (less than a 0.10 mL difference between each other).

Dilution: the process of reducing the concentration of a solute in solution, usually by mixing it with more solvent.

End-point: a physical change in the solution as determined by the indicator.

Indicator: a dye or mixture of dye that marks the end-point of the titration.

Titration: a technique to measure the concentration of acid or alkali in a sample, by comparing it to the concentration of alkali or acid in a standard solution

Titre: the total volume of solution added to reach the end-point of the titration.

Rough titration: it is used along with the first titration to get an approximation volume that is needed to reach the end-point.

Standard solution: a solution in which the concentration of solute in mol dm^-3 is known accurately.