Paper 3 A-Level Chemistry AQA - All Experiments
1. Make Up a Volumetric Solution: 1. Weigh dry weighing
boat
2. Place mass of solid into the boat and weigh accurately
3. Pour solid into a beaker. Reweigh empty weighing boat and
calculate how much
was transferred
4. Add deionised water and stir with glass rod until dissolved
5. Funnel into a volumetric flask
6. Make up to mark with deionised water until bottom of
meniscus is on the mark
7. Stopper and invert to mix
2. Acid-Base Titration: 1. Fill a burette
2. Use a pipette to transfer 25cm³ of the other solution into the
conical flask
3. Add 2-3 drops of indicator
4. Start adding from the burette, swirling constantly, until the
indicator changes
colour. Record how much solution was added (rough titre)
5. Repeat to get concordant results and calculate a mean titre
3. Measuring Enthalpy Change of Combustion: 1. Measure
100cm³ of water into
a calorimeter
2. Weigh the spirit burner
3. Measure initial temperature of the water
4. Clamp calorimeter above spirit burner
5. Light the spirit burner
6. Heat until the temperature rises by 15°C. Stir and record final
temperature
7. Reweigh spirit burner
8. Calculate temperature change and heat energy change
(q=mcAT)
, 9. Calculate mass of fuel used and moles of fuel used.
Calculate energy change per
mole.
4. Measuring Enthalpy Change of Neutralisation: 1. Place
polystyrene cup in
glass beaker
2. Measure out 25cm³ of 1moldm³ HCl and transfer to
polystyrene cup
3. Stir and record temperature
4. Measure out 25cm³ of 1moldm³ NaOH into another
measuring cylinder.
5. Add NaOH to HCl, stir and record the highest temperature
reached
6. Calculate temperature change and q=mcAT
7. Calculate moles of acid used and water formed, and the
enthalpy of neutralisation
5. Investigating Effect of Temperature on Rate of Reaction:
1. Measure out
50cm³ of aqueous solution A and pour into a clean dry 250cm³
conical flask
2. Measure out 5cm³ of aqueous solution B and pour into test
tube
3. Place conical flask on a piece of laminated paper with a
cross. Add the acid and
start the stopwatch
4. Gently stir and record initial temperature
5. Watch over the top and time how long it takes for the
precipitate to form and cross
to disappear
6. Note the final temperature and calculate the initial and final
temperatures
e.g sodium thiosulfate and acid:
Na2S2O3 + 2HCl --> S + SO2 + H2O + 2NaCl
6. Preparing an Organic Liquid: Heat under reflux.
1. Make Up a Volumetric Solution: 1. Weigh dry weighing
boat
2. Place mass of solid into the boat and weigh accurately
3. Pour solid into a beaker. Reweigh empty weighing boat and
calculate how much
was transferred
4. Add deionised water and stir with glass rod until dissolved
5. Funnel into a volumetric flask
6. Make up to mark with deionised water until bottom of
meniscus is on the mark
7. Stopper and invert to mix
2. Acid-Base Titration: 1. Fill a burette
2. Use a pipette to transfer 25cm³ of the other solution into the
conical flask
3. Add 2-3 drops of indicator
4. Start adding from the burette, swirling constantly, until the
indicator changes
colour. Record how much solution was added (rough titre)
5. Repeat to get concordant results and calculate a mean titre
3. Measuring Enthalpy Change of Combustion: 1. Measure
100cm³ of water into
a calorimeter
2. Weigh the spirit burner
3. Measure initial temperature of the water
4. Clamp calorimeter above spirit burner
5. Light the spirit burner
6. Heat until the temperature rises by 15°C. Stir and record final
temperature
7. Reweigh spirit burner
8. Calculate temperature change and heat energy change
(q=mcAT)
, 9. Calculate mass of fuel used and moles of fuel used.
Calculate energy change per
mole.
4. Measuring Enthalpy Change of Neutralisation: 1. Place
polystyrene cup in
glass beaker
2. Measure out 25cm³ of 1moldm³ HCl and transfer to
polystyrene cup
3. Stir and record temperature
4. Measure out 25cm³ of 1moldm³ NaOH into another
measuring cylinder.
5. Add NaOH to HCl, stir and record the highest temperature
reached
6. Calculate temperature change and q=mcAT
7. Calculate moles of acid used and water formed, and the
enthalpy of neutralisation
5. Investigating Effect of Temperature on Rate of Reaction:
1. Measure out
50cm³ of aqueous solution A and pour into a clean dry 250cm³
conical flask
2. Measure out 5cm³ of aqueous solution B and pour into test
tube
3. Place conical flask on a piece of laminated paper with a
cross. Add the acid and
start the stopwatch
4. Gently stir and record initial temperature
5. Watch over the top and time how long it takes for the
precipitate to form and cross
to disappear
6. Note the final temperature and calculate the initial and final
temperatures
e.g sodium thiosulfate and acid:
Na2S2O3 + 2HCl --> S + SO2 + H2O + 2NaCl
6. Preparing an Organic Liquid: Heat under reflux.
