MI_H2_CHEM_(9729 04)_Prep_List

Apparatus For each candidate 1 1 x 50 cm3 burette 1 x stand and burette clamp 1 x small funnel for filling the burette 1 x 25 cm3 pipette 1 x pipette filler 1 x 250 cm 3 beaker 2 x Styrofoam cup 1 x thermometer (–10 °C to 50 °C) methyl orange indicator indicator [place with bench reagents] 2 x 250 cm 3 conical flask 2 1 x test-tube holder (wooden instead of plastic) 1 x boiling-tube 1 x spatula 1 x Bunsen burner and lighter 1 x wooden tongs access to a balance weighing to 0.1 g or better 3 2 x test-tube 1 x boiling-tube 2 x dropping pipette 2 x spatula 1 x 50 cm 3 beaker 1 x glass rod wooden splints distilled water additional test-tubes and dropping pipettes should be available typical inorganic QA bench reagents: NaOH(aq), BaNO 3(aq), red litmus paper 2018 PU3 EoY P4 Prep List

Chemicals Required label per candidate identity notes (hazards given in this column are for the raw materials) reference 1 FA 1 230 cm3 1.8 mol dm–3 potassium hydrogen carbonate, KHCO3 2016 PU1 H2 Expt 7 FA 2 130 cm3 1.0 mol dm–3 of potassium hydroxide, KOH FA 3 100 cm3 1.6 mol dm–3 of hydrochloric acid, HCl 2 FA 4 5 g a mixture of NaHCO3 and Na2CO3 Prepare a mixture containing 3 parts by mass NaHCO 3 and 1 part by mass anhydrous Na2CO3. The anhydrous Na2CO3 should be dried before use by heating in an oven at 110 °C and cooled in a desiccator. Do not heat the NaHCO3. Ensure the mixture is as uniform as possible. Each candidate should be provided with 5 g of the mixture in a labelled, capped container. 2010 Nov 9701/34 3 FA 5 1 g ammonium ferric sulfate, NH4Fe(SO4)2·12H2O / NH4[Fe(H2O)6](SO4)2·6H2O Pure solid, keep dry. Solid is chunky and should be broken up to smaller bits. Each candidate should be provided with 1-1.2 g of the mixture in a labelled, capped container. – zinc powder 0.5 g (sufficient for about 2 spatulas) zinc powder Pure solid, keep dry. barium nitrate for QA (about 3 cm3) 0.1 mol dm-3 barium nitrate Dissolve 26.1g of Ba(NO 3)2 in each dm3 of solution.