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AQA A-level Chemistry Titrations

Titrations

This page covers the following topics:

1. Methods of titration
2. Titration experimental set up
3. Titration calculations
4. Indicators

Titrations are a laboratory method of quantifying the concentration of a solution.

Methods of titration

This is a diagram of a titration set up.

Titration experimental set up

Titration with a weak acid, (e.g. CH₃COOH) and a strong base (e.g. NaOH) would give a titration curve. In the case where one of either acid or base is weak, and the other is strong then the equivalence point is not at pH 7.

Titration calculations

During titrations, acid-base indicators are used to indicate a neturalisation reaction has taken place. The acid and base forms of the indicator have different colours thus a colour change indicates the reation change.

Indicators

1

Which indicator from the ones provide in the table changes from red (acid) to yellow (base) in an cid-base titration?

Which indicator from the ones provide in the table changes from red (acid) to yellow (base) in an cid-base titration?

2

In terms of pH range, what is important to consider when choosing an indicator for a titration?

In terms of pH range, what is important to consider when choosing an indicator for a titration?

3

50 mL of a 0.2 mol/dmΒ³ CH₃COOH solution is added to a 25mL NaOH solution. What is the concentration of the NaOH to 1 decimal place?

50 mL of a 0.2 mol/dmΒ³ CH₃COOH solution is added to a 25mL NaOH solution. What is the concentration of the NaOH to 1 decimal place?

4

What is the role of the funnel?

What is the role of the funnel?

5

What is the reading on this burette in cmΒ³?

What is the reading on this burette in cmΒ³?

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