titrations
- Created by: Margaret Hobart
- Created on: 27-04-21 09:15
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- titrations
- standard solution
- any solution you know the exact concentration
- 1. fill volumetric flask with 100cm3 of distilled water
- 2. using weighing boat, weigh 2.65g of Na2CO3
- 3. put Na2CO3 in volumetric flask and shake until dissolved
- 4. add more water to the 250cm3 line (bottom of meniscus reaches line)
- 3. put Na2CO3 in volumetric flask and shake until dissolved
- 2. using weighing boat, weigh 2.65g of Na2CO3
- titrations let you find how much acid is needed to neutralise a measured quantity of alkali
- method
- 1. fill burette with acid
- 2. measure 25cm3 of alkali using pipette
- 3. pour alkali into conical flask and place onto white tile under closed burette
- 4. add drops of phenol phthalein (indicator) to flask
- 5. using burette drop 5cm3 at a time into flask, swirling regularly
- 6. once solution has gone colourless stop and measure end volume. this is your rough titre
- 7. repeat steps 1-4
- 8. add acid drop by drop, swirling regularly
- 9. measure end volume and work out titre
- 10. repeat until you have concordant results
- 9. measure end volume and work out titre
- 8. add acid drop by drop, swirling regularly
- 7. repeat steps 1-4
- 6. once solution has gone colourless stop and measure end volume. this is your rough titre
- 5. using burette drop 5cm3 at a time into flask, swirling regularly
- 4. add drops of phenol phthalein (indicator) to flask
- 3. pour alkali into conical flask and place onto white tile under closed burette
- 2. measure 25cm3 of alkali using pipette
- 1. fill burette with acid
- standard solution
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