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
Loading...
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.