# Titrations: calculating an unknown concentration

I can calculate the concentration of an acid using results from a neutralisation titration.

# Titrations: calculating an unknown concentration

I can calculate the concentration of an acid using results from a neutralisation titration.

## Lesson details

### Key learning points

- Data collected during a titration allows chemists to determine a solution’s unknown concentration.
- Concordant titres should be used when calculating a mean volume used to neutralise a solution.
- The coefficients in a balanced equation indicates the stoichiometry (i.e. molar ratio) between substances in a reaction.
- The concentration of an unknown solution is found using the relationship: concentration = moles ÷ volume (in dm³).

### Common misconception

Pupils use all of their titration results to calculate an average volume used during titration. Pupils also tend to miss steps in this multi-step process.

Stress the need to use concordant results when calculating an average volume for neutralising a solution via titration. Use a calculation grid to help keep each calculation step clearly organised.

### Keywords

Titration - A technique in volumetric analysis that is used to find the exact volumes of solutions that react with each other.

Titre - The volume of titrant needed to reach the end point in a titration.

Concordant - Readings within a certain range. For titrations, these usually need to be within 0.10 cm³ of each other.

Coefficient - The number placed in front of a chemical formula to balance an equation; it shows the ratio of substances in a reaction.

Mole - 1 mole contains 6.02 × 10²³ particles. The mass of a mole of a substance is its relative mass expressed in grams.

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Video

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## Starter quiz

### 6 Questions

## Exit quiz

### 6 Questions

A technique to find exact volumes of reacting solutions.

The volume of titrant needed to reach the end point.

Readings within ±0.10 cm³ of each other.

A number showing the ratio of substances in a reaction.

1 mole contains 6.02 × 10²³ particles.