CHEMISTRY PAPER 3 (CONFIDENTIAL) - KCSE 2019 MASENO MOCK EXAMINATION (WITH MARKING SCHEME)

Requirements for candidates
In addition to the apparatus and fittings found in a Chemistry laboratory, each candidate will require the following.

• Exactly 4.5g of solid A
• About 100cm³ of solution B
• One burette 0 – 50ml
• One pipette 25ml
• Two conical flasks 250ml
• Thermometer
• 100ml measuring cylinder
• About 1g of solid E
• About 1g of solid F
• Phenolphthalein indicator
• Universal indicator solution
• PH Chart (1-14 range)
• About 500ml of distilled water in a wash bottle
• 5 dry test tubes
• 1 Boiling tube
• Clean Metallic spatula
• Blue and red litmus papers
• About 0.5g sodium hydrogen carbonate solid

Each candidate should have access to:

• Source of heat
• 2M sodium hydroxide supplied with a dropper
• 2M ammonium hydroxide supplied with a dropper
• 2M HCl acid supplied with a dropper
• Lead (II) nitrate supplied with a dropper
• Acidified potassium manganate (VII) supplied with a dropper
• 5M Barium chloride supplied with a dropper

NOTES

• Solid A is 4.5g of oxalic acid weighed accurately and stoppered.
• Solid E is Ammonium aluminium sulphate
• Solid F is maleic acid.
• Solution B is 0.4M NaOH.