Laboratory sessions
Answers are for parents and teachers.
1
Calculate Mᵣ of Al₂(SO₄)₃ (Aᵣ: Al 27, S 32, O 16).
342
2
Calculate Mᵣ of KNO₃ (Aᵣ: K 39, N 14, O 16).
101
3
Session 4: how would you detect chloride in a soil solution? State the reagent and the result.
Add AgNO₃ to the filtered solution: a white AgCl precipitate shows chloride.
4
Why is a safer solvent chosen in session 6 instead of benzene?
Benzene causes cancer and is poisonous.
5
Write the 3 most important safety rules you learned during the year.
Pour acid into water; never smell or taste; goggles and gloves, work under adult supervision.