RP - Titration
- Created by: India.02
- Created on: 08-05-19 11:42
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- RP - Titrations
- Method
- 1. To find the concentration of some alkali - use a pipette and a pipette filler add a set volume of the alkali to a conical flask - add 2 or 3 drops of indicator too
- 2. Use a funnel to fill a burette with some acid of known concentration - do this below eye level to avoid acid falling in your eyes - record the initial volume of acid in the burette
- 3. Use burette to add the acid to the alkali a bit at a time - give flask a swirl and swirl slowly when you think it is close to the end
- 4. Indicator changes colour when all the alkali has been neutralised - phenol-phthalein is pink in alkaline conditions, but colourless in acidic conditions
- 5. Record the final volume of acid in the burette, and use it, along with the initial reading, to calculate the volume of acid used to neutralise the alkali
- Repetition
- Repeat the test to increase the accuracy and spot any anomalous results - several consistent readings
- Calculate a mean of your results and ignore any anomalous results
- Indicators
- Universal Indicator is used to estimate the pH of a solution because it can turn into a range of colours - each colour indicates a narrow range of pH
- Phenol-phthalein - colourless in acids and pink in alkalis
- Litmus - red in acids and blue in alkalis
- Methyl Orange - red in acids and yellow in alkalis
- Appartus
- Pipette - measures only one volume of solution - fill about 3cm above the line and then drop the level to the line
- Burette - measures different volumes and let you add the solution drop by drop
- Conical Flask - holds the liquids that are used in the test
- Scale - shows the volume of acid used
- Method
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