R.P

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Created by
Sadia

Cards (6)

  • titration r.p
    1. using pipette add 10cm3 of acid into conical flask and fill burette with the solution
    2. add a few drops of phenolphthalein indicator to the CF
    3. perform a rough titration
    4. whilst swirling the contents of the CF against a white tile
    5. stop adding solution when end-point is reached (colourless to pink)
    6. fill up burette again and perform titration again by adding sodium hydroxide dropwise near to the end point to a new CF of 10cm3 of acid
    7. repeat titration until concordant results are obtained
    8. calculate average volume of solution used.
  • Measure temperature change
    1. Measure 30cm3 of dilute acid using measuring cylinder
    2. Transfer acid into a polystyrene cup
    3. Stand the polystyrene cup inside a beaker - stops cup falling
    4. Use thermometer to measure the temp of acid and record in table
    5. Measure 5cm3 of solution and transfer it into the cup
    6. Put lid on the cap and place thermometer through the hole in the lid
    7. Use a thermometer gently stir solution
    8. Look at the temp rising on thermometer. when the reading stops changing record the highest temp reached
    9. Rinse out and dry the cup
    10. Repeat experiment using 10cm3 of solution 4 times
    11. Increase volume of solution by 5 each time until we reach a maximum if 40cm3 of solution
    12. Repeat once more for 2 sets of results and calc mean value for max temp reached for each volume of sodium hydroxide solution
    13. Plot a graph
  • temperature change r.p
  • why is polystyrene good?
    thermal insulator so reduces heat loss
  • Measure temperature change

    1. Measure 30cm3 of dilute acid using measuring cylinder
    2. Transfer acid into a polystyrene cup
    3. Stand the polystyrene cup inside a beaker - stops cup falling
    4. Use thermometer to measure the temp of acid and record in table
    5. Measure 5cm3 of solution and transfer it into the cup
    6. Put lid on the cap and place thermometer through the hole in the lid
    7. Use a thermometer gently stir solution
    8. Look at the temp rising on thermometer. when the reading stops changing record the highest temp reached
    9. Rinse out and dry the cup
    10. Repeat experiment using 10cm3 of solution 4 times
    11. Increase volume of solution by 5 each time until we reach a maximum if 40cm3 of solution
    12. Repeat once more for 2 sets of results and calc mean value for max temp reached for each volume of sodium hydroxide solution
  • Plot a graph