A student neutralises an alkali with an acid in a titration experiment.
acid + alkali → ............................... + ...............................
[2]
Higher Only
Look at the student’s method for her experiment.
• Measure 25.0 cm3 of alkali solution into a conical flask using a pipette.
• Add a few drops of universal indicator to the alkali solution.
• Fill the burette to above the 0.0 cm3 line with acid.
• Quickly add the acid to alkali until the indicator changes colour.
• Repeat the experiment until consistent results are obtained.
Describe and explain one improvement the student should make to her method to get a more accurate titration result.
[2]
The student repeats the experiment three times.
Look at the student’s results.
Titration number | 1 | 2 | 3 |
Volume of acid (cm3) | 25.75 | 23.60 | 23.70 |
Calculate the accurate volume of the acid that reacts with the alkali.
Accurate volume of acid = .................................................. cm3 [2]
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