CHEMISTRY PAPER 3 CONFIDENTIAL - KAPSABET BOYS 2019 TRIAL MOCK EXAMINATION

INSTRUCTIONS TO SCHOOL
(CONFIDENTIAL)

In addition to the equipment and fittings found in a chemistry laboratory. Each candidate should be provided with;

1. Solid A 5.0g measured accurately
2. About 80cm³ of solution B
3. About 0.5g solid C
4. About 10cm³ of liquid D
5. A thermometer (-10-110⁰C)
6. A burette
7. A complete retort stand
8. A pipette and a pipette filler
9. 2 conical flasks
10. A 250ml volumetric flask
11. One boiling tube
12. Five (5) test tubes
13. 5g sodium hydrogen carbonate
14. Two labels

ACCESS TO:

• Means of heating (Tripond stand and wire gauze)
• Sodium sulphate solution (NaSO₄)
• Ammonia solution 2m
• 2m Sodium Hydroxide
• Lead Nitrate solution
• Barium Nitrate solution
• Acidified potassium manganite (VII) solution
• Bromine water
• Acidified potassium dichromate(VI) solution

NB:

• Solid A is 5.0g of oxalic acid (COOH₎₂ 2H₂O
• Solution B is Kmno₄
• Solid C is magnesium chloride MgCl₂
• Liquid D is absolute ethanol

Preparations

1. Solution B is made by dissolving 20g of solid Kmno4 in 200cm³ of 2.0m H₂SO₄ and toping to 1000cm³ by distilled water.
2. Sodium Hydroxide is prepared by dissolving 80g of NaOH pellets in 600cm3 of distilled water and top to 1000cm³ with distilled water.
3. Ammonia solution is prepared by dissolving 150ml of conc ammonia to 600cm³ of distilled water then top to the mark.
4. Barium Nitrate is prepared by dissolving 26g of solid Barium Nitrate in 600cm³ of water then topping to 1000cm³ with distilled water.
5. Lead nitrate is prepared by dissolving 30g of solid Lead Nitrate in 600cm³ of water then topping to 1000cm³ with distilled water.
6. Sodium Sulphate is prepared by dissolving 14.2g of solid sodium sulphate in 600cm³ of distilled water then topping up to 1000cm³ with distilled water.
7. Acidified Kmno₄ is prepared by dissolving 3.2g of solid Kmno₄ in 200cm³ of 2.0m H₂SO₄ acid then topping with distilled water to 1000cm³.
8. Acidified K₂Cr₂O₇ is prepared by dissolving 25g of solid K₂Cr₂O₇ in 200cm³ of 2.0m H₂SO₄ then topping to 1000cm³ with distilled water.