NJC_2025_H2_Chemistry_Prelim_P4_Chemical List

SH2 2025 Chemical List for SH2 Preliminary Practical Exam Term 3 Week 10 (1st Sept 2025) Chemicals: FA 1 is 1.0 mol dm−3 sulfuric acid, H2SO4 FA 2 is 1.3 mol dm−3 sodium hydroxide, NaOH FA 3 is 0.552 mol dm‒3 aqueous copper(II) sulfate, CuSO4(aq) FA 4 is 0.100 mol dm‒3 sodium thiosulfate, Na2S2O3 FA 5 is a 10% solution of potassium iodide, KI. Starch indicator FA 7 is aqueous ammonium iodide, NH4Cl FA 8 is aqueous zinc sulfate, ZnSO4 FA 9 is aqueous sodium nitrate, NaNO3 Apparatus: 1 x Styrofoam cup 1 x 250 cm3 beaker 2 x 50 cm3 measuring cylinder (1 of them labelled FA 2) 1 x 0.2 ᵒC thermometer 2 x 50 cm3 burette 1 x retort stand with clamp 2 x filter funnel 1 x 25.0 cm3 pipette and pipette filler 2 x 250 cm3 conical flasks 1 x 10 cm3 measuring cylinder 1 x 250 cm3 graduated flask 6 x dropper 1 x white tile 2 x boiling tube 6 x test-tube Paper towel Wash bottle containing deionised water Name Chemical Quantity per student Total Quantity Remarks FA 1 1.0 mol dm−3 sulfuric acid, H2SO4 220 cm3 220 cm3 x 390 students ≈ FA 2 1.3 mol dm−3 sodium hydroxide, NaOH 250 cm3 250 cm3 x 390 students ≈ FA 3 aqueous copper(II) sulfate, CuSO4(aq) containing 138.0 g dm‒3 of hydrated copper(II) sulfate, CuSO4.5H2O 100 cm3 100 cm3 x 390 students ≈ Mr of CuSO4.5H2O = 249.6 [CuSO4.5H2O] = 0.552 mol dm‒3 Dissolve 138.0 g in 1 dm3 deionised water.

FA 4 0.100 mol dm‒3 sodium thiosulfate, Na2S2O3, containing 15.81 g dm‒3 of anhydrous sodium thiosulfate *If only hydrated sodium thiosulfate, Na2S2O3.5H2O, is avail, the appropriate mass to prepare 0.100 mol dm‒3 solution should be used. 150 cm3 150 cm3 x 390 students ≈ L If using anhydrous Na2S2O3: Mr of Na2S2O3 = 158.2 To prep 0.100 mol dm‒3 solution, dissolve 15.82 g in 1 dm3 deionised water. If using hydrated Na2S2O35H2O: Mr of Na2S2O3.5H2O = 248.2 To prep 0.100 mol dm‒3 solution, dissolve 24.82 g in 1 dm3 deionised water. FA 5 10% solution of potassium iodide, KI, containing 100.0 g dm‒3 of potassium iodide *Solution should be freshly prepared using fresh KI(s) 60 cm3 60 cm3 x 390 students ≈ L Dissolve 100.0 g in 1 dm3 deionised water. Starch indicator containing 4 g dm‒3 of soluble starch 5 cm3 5 cm3 x 390 students ≈ L FA 7 Aqueous ammonium chloride, NH4Cl 10 cm3 NH4+, Cl - FA 8 Aqueous zinc sulphate, ZnSO4 10 cm3 Zn2+, SO42- FA 9 Aqueous sodium nitrate, NaNO3 10 cm3 Na+, NO3- Bench reagents: NH3(aq) NaOH (aq) Red litmus paper Wooden splint H2SO4(aq) Ca(OH)2 (aq) KMnO4(aq) Lighter HNO3(aq) AgNO3(aq) Aluminium foil