# Chemistry AS CI 1.5 ES

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- Created by: A.B.
- Created on: 17-02-14 11:00

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- ES Concentrations of Solutions CI 1.5
- Calculations of Concentrations
- Concentrations CAN be measured in grams per cubic decimetre (gdm-3)
- (mass/volume)
- BETTER to measure quantities in moles so concentration moldm-3
- Triangle

- BETTER to measure quantities in moles so concentration moldm-3
- Triangle

- Concentrations CAN be measured in grams per cubic decimetre (gdm-3)
- Using Concentrations in Calculations
- Titrations
- Method of quantitatively finding the concentration of a solution by reacting a known volume of it with another solution of known concentration.
- The end point of a reaction is often detected by the use of an indicator which changes colour.

- 1. A fixed volume of solution (unknown concentration) is pipetted into a concical flask.
- 2. A few drops of suitable indicator are added and the flask is placed onto a white tile.
- 3. The solution of known concentration is added slowly from a burette, with constant swirling.
- 4. As you approach the end-point, add the solution from the burette dropwise.
- 5. After a rough titration, accurate titrations follow until concordant results are obtained.

- 4. As you approach the end-point, add the solution from the burette dropwise.

- 3. The solution of known concentration is added slowly from a burette, with constant swirling.

- 2. A few drops of suitable indicator are added and the flask is placed onto a white tile.
- Titration Calculations
- Find the ratio of moles in the equation
- Use triangle

- Find the ratio of moles in the equation

- Method of quantitatively finding the concentration of a solution by reacting a known volume of it with another solution of known concentration.

- Titrations

- Calculations of Concentrations

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