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OCR GCSE 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

The result of the titration can be used to calculate the previously unkown concentration of the solution. Using the known volume and concentration from the titrant, and the ratio of moles between the two solutions in a neutralisation reaction, the concentration of the solution can be found.

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

Complete the triangle.

Complete the triangle.

3

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?

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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