Question detail

What is the role of a titration in determining the concentration of an unknown solution? Explain the steps involved in a simple acid-base titration.

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

At a glance

Question

Type

exam_style

Style

Topic

A-level practical endorsement and required practical activities

Question

What is the role of a titration in determining the concentration of an unknown solution? Explain the steps involved in a simple acid-base titration.

Answer

A titration is used to determine the concentration of an unknown solution by reacting it with a solution of known concentration. The steps involved include: 1) filling a burette with the titrant (known solution), 2) adding a few drops of indicator to the analyte (unknown solution) in a flask, 3) slowly adding the titrant to the analyte while swirling until the endpoint is reached, indicated by a color change. The volume of titrant used is then measured to calculate the concentration of the unknown solution. This answer is anchored to A-level required practical activities.

Explanation

A titration is used to determine the concentration of an unknown solution by reacting it with a solution of known concentration. The steps involved include: 1) filling a burette with the titrant (known solution), 2) adding a few drops of indicator to the analyte (unknown solution) in a flask, 3) slowly adding the titrant to the analyte while swirling until the endpoint is reached, indicated by a color change. The volume of titrant used is then measured to calculate the concentration of the unknown solution. is the best answer because it directly supports the AQA A-Level Chemistry objective to required practical 1: make up a volumetric solution and carry out a simple acid-base titration. This reasoning is anchored to A-level required practical activities in A-level practical endorsement 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

Common Mistake in Titration Calculations

Students often forget to convert the volume of the solution from cm³ to dm³ when calculating concentration.

To fix this, remember that 1 dm³ = 1000 cm³. Use the formula for concentration: concentration (mol/dm³) = moles / volume (dm³). Convert the volume by dividing the cm³ value by 1000 before substituting into the formula. For example, if you have 25 cm³ of solution, convert it to dm³: 25 cm³ ÷ 1000 = 0.025 dm³. Then, if you have 0.1 moles of solute, the concentration would be: concentration = 0.1 moles / 0.025 dm³ = 4 mol/dm³. Keep the correction anchored to A-level required practical activities and the objective: Required practical 1: make up a volumetric solution and carry out a simple acid-base titration.

Related flashcards

Flashcard 1 of 5

Press Space to flip, arrows to move

Related practice questions

Question 1 of 5

Choose an answer, get feedback, then move sideways through the set.

0 of 5 attempted
exam Q2: out a simple acid-base titration. | A-level practical… | ExamCompanion