The higher the concentration of a sample of dilute sulfuric acid, the greater the volume of sodium hydroxide needed to neutralise the acid. The student tested two samples of dilute sulfuric acid, P and Q. Describe how the student could use titrations to find which sample, P or Q, is more concentrated. – 6138

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1. Measure a fixed volume of acid using a pipette.

   Add a few drops of indicator to the acid in a conical flask.

   Slowly add sodium hydroxide from a burette while swirling until the colour changes.

   Record the volume of sodium hydroxide used.

   Repeat the same steps for the other acid.

   Compare the two volumes of sodium hydroxide used — the acid that needs more sodium hydroxide is the more concentrated one.

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