CHEMISTRY PRACTICAL (3a) Pipette (or burette) (ii) Used as container for melting and heating to a very high temperature (iii) Crucible (iv) used for measuring heat of combustion of a substance (3b) PbSO₄ < PbCl₂ < PbNO₃ (3c) No effect (ii) Turns red litmus blue (iii) Turns blue litmus red

Let's check your answers:

3. (a) Complete the following table

• (i) Pipette (or burette)

  • Your apparatus: "Pipette (or burette)" ✅ Correct.
  • Your use: (missing)
  • The use is: For measuring specific volume of a liquid.

• (ii) Used as container for melting and heating to a very high temperature

  • Your use: "Used as container for melting and heating to a very high temperature" ✅ Correct use.
  • Your apparatus: (missing)
  • The apparatus for this use is a Crucible.

• (iii) Crucible

  • Your apparatus: "Crucible" ✅ Correct.
  • Your use: (missing)
  • The use is: As container for melting and heating to a very high temperature.

• (iv) used for measuring heat of combustion of a substance

  • Your use: "used for measuring heat of combustion of a substance" ✅ Correct use.
  • Your apparatus: (missing)
  • The apparatus for this use is a Bomb calorimeter.

3. (b) Arrange the following salts in increasing order of solubility: $\text{PbCl}_2$, $\text{PbSO}_4$, and $\text{PbNO}_3$.

• Your answer: $\text{PbSO}_4 < \text{PbCl}_2 < \text{PbNO}_3$ ✅ Correct.

3. (c) State the effect of the following solution on litmus

• (i) $\text{KNO}_3(\text{aq})$:
  • Your answer: "No effect" ✅ Correct.
• (ii) $\text{K}_2\text{CO}_3(\text{aq})$:
  • Your answer: "Turns red litmus blue" ✅ Correct.
• (iii) $\text{Al}_2(\text{SO}_4)_3(\text{aq})$:
  • Your answer: "Turns blue litmus red" ✅ Correct.

You have correctly identified the solubility order and the litmus effects. For part 3(a), you correctly identified the apparatus where given, and the uses where given, but some parts were missing or mismatched.