Page 145 - Chemistry

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(iii) To 2cm of the mixture add two drops of acidified potassium manganese (VII) and shake
well

SOTIK DISTRICT

CONFIDENTIAL
Requirements:
In addition to the equipment, apparatus and chemical found in the chemistry
laboratory each candidate will require the following:
 About 100cm³ of solution L
 About 100cm³ of solution N
 A burette
 A pipette
 3 conical flasks
 4.0g of solid K
 Thermometer
 Distilled water
 Test tube holder
 3 boiling tubes
 Phenolphthalein indicator
 Filter paper
 Filter funnel
 Source of heat
 1g of solid x
 10ml measuring cylinder
 2M HNOз
 Seven test tubes
 Stirring rod
 2M NaOH
 2M NH 4OH
 2M HCL
 0.5M lead (II) nitrate
 0.5M barium chloride
NOTES
-Solution L is prepared by dissolving 5g of NaOH in a litre of distilled water
-Solution N is prepared by dissolving 9.84g of C 2H 2O 4.2H 2O in a litre of distilled water (oxalic
acid)
-Solid K is potassium chlorate
-Solid X is a mixture of copper (II) oxide and zinc sulphate in the ratio 1:1

1. You are provided with:-
(i) Solution L containing 5g per litre of sodium hydroxide
(ii) Solution N containing 9.84g per litre of oxalic crystals of formula C 2H 2O 4.X H 2O
(iii) You are required to determine the number of moles of water of crystallization X in
one mole of oxalic acid (C 2H 2O 4. XH 2O)
(iv) You are required to determine the number of moles of water of crystallization X; in one
mole of oxalic acid (C 2H 2O4. XH 2O)
Procedure
(i) Fill the burette with solution N.

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