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Follow a neutralisation reaction by monitoring pH.

In this reaction we are going to react an acid with an alkali and measure the pH change during the reaction.

The acid will react with the alkali to produce a salt and water – no gas is produced.

Also, in this reaction there is no colour change.

However, the pH will change.

Apparatus and chemicals

• 100 cm³ beaker
• Measuring cylinder (25cm³)
• 1 mol/dm³ HCl (15cm³)
• 1 mol/dm³ NaOH (15cm³)
• Universal indicator solution
• Universal indicator colour chart
• Dropping pipette
• Stirring rod