13620.08R 3 [Turn over Practical Examination Question 1 Each candidate must be supplied with: • 1 × watch glass • 1 × piece of nichrome wire • 1 × spatula • 1 × Bunsen burner • 1 × heat proof mat • 2 × 250 cm3 beakers • 1 × glass rod • Several 3 cm3 graduated disposable pipettes • 1 × 250 cm3 volumetric flask • 2 × filter funnel • 1 × 25.0 cm3 pipette of at least class B quality • 1 × safety pipette filler • 1 × white tile • 2 × 250 cm3 conical flasks • 1 × 50.0 cm3 burette of at least class B quality • 1 × wash bottle of deionised water • 1 × retort stand, boss head and clamp/burette holder • 2.5 g of a 50/50 mixture of anhydrous sodium carbonate and sodium hydrogencarbonate in a stoppered container labelled S and moderate hazard (exclamation mark label) • approximately 150 cm3 of dilute hydrochloric acid in a container labelled 0.1 mol dm–3 hydrochloric acid and moderate hazard (exclamation mark label). This solution should be approximately 0.1 mol dm–3 • access to concentrated hydrochloric acid (fume cupboard) for use in a flame test labelled concentrated hydrochloric acid and corrosive and moderate hazard (exclamation mark label) 13620.08R 4 [Turn over • methyl orange indicator labelled methyl orange • phenolphthalein indicator labelled phenolphthalein and flammable and moderate hazard (exclamation mark label) • access to an electronic balance