Question detail

Describe the process of carrying out a simple acid-base titration, including the apparatus used and the steps involved.

Try the question, check the answer, then read the explanation to understand the curriculum point.

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Question

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Style

Topic

AS practical skills and required practical activities

Question

Describe the process of carrying out a simple acid-base titration, including the apparatus used and the steps involved.

Answer

In a simple acid-base titration, a burette is filled with a standard solution of acid or base. A measured volume of the other solution is placed in a conical flask with a few drops of indicator. The titrant is added from the burette to the flask while swirling until the endpoint is reached, indicated by a color change. The volume of titrant used is recorded. This answer is anchored to AS apparatus and techniques.

Explanation

In a simple acid-base titration, a burette is filled with a standard solution of acid or base. A measured volume of the other solution is placed in a conical flask with a few drops of indicator. The titrant is added from the burette to the flask while swirling until the endpoint is reached, indicated by a color change. The volume of titrant used is recorded. is the best answer because it directly supports the AQA A-Level Chemistry objective to use heating, titration, distillation, filtration and chromatography techniques. This reasoning is anchored to AS apparatus and techniques in AS practical skills and required practical activities, and it separates titration from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.

Common mistake

Incorrect Titration Technique

Students often forget to record the initial and final burette readings accurately during a titration, leading to incorrect volume calculations.

To fix this, always note the initial reading before starting the titration and the final reading after the endpoint is reached. Use the formula: volume of titrant used = final reading - initial reading. For example, if the initial reading is 10.0 mL and the final reading is 25.0 mL, then: 25.0 mL - 10.0 mL = 15.0 mL. Therefore, the volume of titrant used is 15.0 mL.

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