Titrations · Year 12

In Year 12 you get fluent with: titration apparatus and the end point; concordant titres and the mean titre; titration calculations.

In a titration, a pipette measures an exact volume of one solution into a conical flask and a burette adds the other until they just react, shown by a sudden colour change of an indicator: the end point. Repeat until the titres are concordant and take their mean. From the known solution’s moles and the ratio in the equation, you can find the unknown concentration.

Key facts

• In a titration a pipette measures one solution (often 25.0 cm³) into a flask, and a burette adds the other until the indicator changes colour: the end point.
• Repeat until the titres are concordant (within 0.10 cm³ of each other) and use their mean.
• 1 dm³ = 1 litre = 1000 cm³: divide a volume in cm³ by 1000 to get dm³.
• concentration (mol/dm³) = moles ÷ volume (dm³), so moles = concentration × volume.

Worked examples

Other years

• Titrations · Year 11
• Titrations · Year 13