How to do Titrations - IGCSE Chemistry

Acid - Alkali Titrations

A titration experiment can be used to calculate the concentration of an acid or alkali.

Materials

The following equipment is required:

a pipette for precisely measuring a specific volume of acid or alkali

a pipette filler for safe pipette usage

a conical flask to hold the pipette's liquid

a burette to measure and add smaller quantity of one reactant to the other in the conical flask

Method:-

This is a sketch of a method for doing a titration in which an acid is introduced to alkali.

Add 25 cm3 of alkali to a clean conical flask using the pipette and pipette filler.

Place the conical flask on a white tile and add a few drips of indicator.

Fill the burette halfway with acid and take note of the beginning volume.

Slowly pour the acid from the burette into the conical flask, stirring to combine.

When the end-point is achieved, stop adding the acid (the appropriate colour change in the indicator happens). Take note of the last volume reading.

The same approach may be used to add an alkali to an acid; simply change the liquids in the conical flask and burette.