Ucles 0971/51/CI/M/J/18

Question 1 :                                                     HazCard = No

Each candidate will require the following chemicals and apparatus. Label do NOT need to include Concentration.

• 250cc of Aqueous sodium thiosulfate Na2S2O35H2O containing 40g/L labelled : Aqueous sodium thiosulfate (Freshly prepared)

• 100cc of HCl 2.0 M labelled  : Dillute Hydrochloric acid

• Access to water and Distilled water

• 50cc Measuring cylinder

• 10cc Measuring cylinder

• 250 conical flask

• teat pipette

• Stop-clock

Per 5 candidate

A bucket labelled Quenching bath must be provided

the bucket must contain 1 Liter of approximately 5% sodium carbonate (made up by dissolving 50 g of Na2CO3 or 135g of Na2CO3 10H2O in 1 liter of water.  if it become acidic add 5% of sodium carbonate solution to the Quenching.

Question 2 :                                   HazCard = No

Each candidate will require the following chemicals and apparatus. Label do NOT need to include Concentration.

• 12cc of 1.0M Nitric acid in a stoppered test tube labelled  solution A

• 0.3g of basic Zinc carbonate or Zinc carbonate, ZnCO3 in a stoppered test tube labelled Solid B

• 1.0 M Aqueous ammonia

• 1.0 M aqueous sodium Hydroxide

• Solid Copper(II) oxide

• 2cm strip of Magnesium Ribbon

• Small piece of aluminium approximately 1cm X 1cm in size

• Lime water and apparatus used to test for CO2

• distilled water

• pH indicator paper and chart

• red and blue litmus paper

• splints

• Bunsen burner and matches/ lighter

• rack + test tube

• 2 X boiling tubes

• test tube holder

• teat pipette

• spatula

                                                                                                                     Question 1 and 2

Question 2                                                                                                 Quenching bath

Question 1                                                                                                                               Question 2

 Chemical and apparatus for Question 2