cameroon gce advanced level 2021 engineering science 3

cameroon gce advanced level 2021 engineering science 3

cameroon gce advanced level 2021 engineering science 3

100 ml beaker, burette, retort stand and clamp, water, 50 cm³ measuring cylinder, 0.50 mol/dm³ sodium hydroxide, (NaOH_(aq)), ethanoic acid, (CH₃COOH_(aq)), phenolphthalein,

1. Mount up the burette on the retort stand and clamp.
2. Fill the burette with 0.50 mol/dm³ sodium hydroxide solution (titrant) and record the initial volume, V₁ in table 1 below.
3. Measure 10 ml of ethanoic acid using the measuring cylinder and pour into the beaker.
4. Add four (4) drops of phenolphthalein indicator into the beaker containing the acid and note the colour of the solution. Record the colour observed.
   Colour =

   (1 mark)

5. Open the burette clip and run the base into the acid slowly until the equivalence point of the titration is reached.
6. Measure and record the final volume of the base solution that reaches the equivalence point of the titration V₂. Record your value in table 1 below.
7. Note the colour of the solution at the equivalence point. Record the colour observed.
   Colour =

   (1 mark)

8. Repeat the procedure twice and record the data in table 1 below.

Table 1