planning

Question 1

thermometric titration

Answer 1

1. Fill a 50.00 cm3 burette with BaCl2.
2. Place a clean and dry Styrofoam cup inside a second Styrofoam cup which is
   held in a 250 cm3 beaker.
3. Using a 100.0 cm3 measuring cylinder, measure 100 cm3 of deionised water and
   pour into the Styrofoam cup.
4. Add the dry pellets into the deionised water in the Styrofoam cup. Stir to
   dissolve all the pellets using a glass rod / thermometer.
5. Place a lid with a hole in the centre on the cup and insert a thermometer with
   0.2 oC graduation through the lid.
6. Stir the solution in the cup with the thermometer and measure and record the
   initial temperature.
7. Lift the lid and add 3.00 cm3 (or any acceptable volume which will allow 5 readings
   after the minimum volume calculated in part (a)) of BaCl2 from the burette and stir
   with thermometer.
8. Close the lid and measure and record the maximum temperature of the
   mixture.
9. Repeat points 7 and 8 until there are at least 5 points for an increase in
   temperature and 5 points for a decrease in temperature after that. Record the total
   volume of BaCl2 after each addition and the maximum temperature noted.
10. The equivalence point is passed when the temperature no longer rises / drops
    when BaCl2 is added.

Answer 2

[Standard Solution]
1. Using the electronic mass balance, measure the mass of a clean, dry weighing bottle and tare
2. Weigh out accurately __ g of X
3. Transfer X into a small clean beaker
4. Rinse the weighing bottle and pour washings into the beaker, do this at least twice
5. Stir gently to dissolve as much of X as possible
6. pour mixture into clean 250cm3 graduated flask using a funnel and a glass rod to guide the flow
7. Rinse the beaker a few times and add washings into the graduated flask
8. Remove the funnel and make up to mark with distilled water using a dropper for the last few drops
9. Mix solution thoroughly by shaking and inverting the flask

[Dilution]
10. Using a burette, add __cm3 of stock solution into 250cm3 graduated flask

[General Titration]
1. Pipette 25.0cm3 of FA1 into 250cm3 conical flask
2. Add 1 to 3 drops of indicator to the conical flask
3. Fill the burette with FA2
4. Titrate the mixture in the conical flask with FA2 from the
burette, swirling continuously t o ensure mixing
5. The end point is indicated by a sharp/permanent colour
change from __ to __ (follow indicator)
6. Repeat steps 1 to 5 until 2 consistent results are achieved, both readings within ±0.10cm3