General:
Washing of the burette and pipette with tap water, distilled water and followed by the respective solutions.If the questions state "titrate Q with P", you should fill your burette with solution P.
MAKE SURE YOU USED THE CORRECT CHEMICALS!!
Pipette:
- When using the pipette to suck up the solution, the tip must be submerged into the solution or else air will enter the pipette.
- When adjusting the solution level of the pipette using the pipette pump, make sure the tip of the pipette is not submerged in the solution.
- When you are trying to get the last drop of solution from the pipette, tap gently the tip on the bottom of the conical flask.
Burette:
- When filling up the burette with chemicals, place the burette on a stool to ensure accuracy of the readings.
- When adjusting the solution level in the burette, remove the funnel from the burette.
- Make sure the burette tip is filled with solution and no bubbles is in the burette.
Titration:
- Swirl the conical flask constantly when doing titration.
- Stop titration when the difference in the 2 readings (volume of solution used) is within 0.1
- Take the average between the 2 readings to use in the subsequent calculation.
Results:
Present your results in the following formatAll values in the table had to be in 1 decimal place.
In this case the solution in the burette is chemical P, if the chemical used is different, please edit the last row.
Calculation section:
- Practical 10 worksheet: Identify acid and calculate concentration
- Practical 11 worksheet: Calculate percentage purity
- To make sure that you have no problems with calculation, try to solve both practical worksheets again.
- Revision of VA worksheets is highly recommended.
Others:
- Please make sure your bench is tidy and arrange the chemicals and apparatus in order.
- Dropper and glass rod should be placed in a beaker filled with distilled water.
- You should not use more than 3 drops of indicator.
- Make sure you have good time management.
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