INSTRUCTIONS TO SCHOOL
(CONFIDENTIAL)
In addition to the equipment and fittings found in a chemistry laboratory. Each candidate should be provided with;
- Solid A 5.0g measured accurately
- About 80cm3 of solution B
- About 0.5g solid C
- About 10cm3 of liquid D
- A thermometer (-10-1100C)
- A burette
- A complete retort stand
- A pipette and a pipette filler
- 2 conical flasks
- A 250ml volumetric flask
- One boiling tube
- Five (5) test tubes
- 5g sodium hydrogen carbonate
- 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
- Solution B is made by dissolving 20g of solid Kmno4 in 200cm3 of 2.0m H2SO4 and toping to 1000cm3 by distilled water.
- Sodium Hydroxide is prepared by dissolving 80g of NaOH pellets in 600cm3 of distilled water and top to 1000cm3 with distilled water.
- Ammonia solution is prepared by dissolving 150ml of conc ammonia to 600cm3 of distilled water then top to the mark.
- Barium Nitrate is prepared by dissolving 26g of solid Barium Nitrate in 600cm3 of water then topping to 1000cm3 with distilled water.
- Lead nitrate is prepared by dissolving 30g of solid Lead Nitrate in 600cm3 of water then topping to 1000cm3 with distilled water.
- 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.
- 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.
- Acidified K2Cr2O7 is prepared by dissolving 25g of solid K2Cr2O7 in 200cm3 of 2.0m H2SO4 then topping to 1000cm3 with distilled water.
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