1. Inquiry-based Chemistry Experiments

3. To identify 4 unlabelled white solids : 3 of them are known to be sodium sulphate, citric acid, & sodium hydrogencarbonate. 1 unknown (ammonium chloride or potassium chloride) Given : dil. & conc. HCl, dil. NaOH, lime water, AgNO 3(aq), KMnO 4 / H + (aq), Mg ribbon, Pt wire, Bunser burner & common apparatus * Special items will be provided upon request

4. 5 unlabelled compounds (3 white solids and 2 colourless solutions) known to be : NaCl, Na 2 CO 3, citric acid, HNO 3, H 2 SO 4 Task : To identify the compounds Given : Cu metal Example 1

5. Add Cu No Gas Brown Gas & blue solution H 2 SO 4 HNO 3 3 white solids & 2 colourless solutions : NaCl, Na 2 CO 3, citric acid, HNO 3, H 2 SO 4 (Given : Cu metal)

6. NaCl, Na 2 CO 3, citric acid Add HNO 3 or H 2 SO 4 Gas Na 2 CO 3 No Gas NaCl or citric acid Add Na 2 CO 3 Gas No Gas Citric acidNaCl

7. 4 colourless liquids are known to be : a liquid alkane ; ethanol a liquid alkene ; ethanoic acid Task : To identify the 4 unlabelled compounds Example 2 Given : solid Na 2 CO 3, acidified KMnO 4 solution

8. liquid alkane, liquid alkene, ethanol, ethanoic acid Given : solid Na 2 CO 3, KMnO 4 / H + solution Add Na 2 CO 3 Gas ethanoic acid No Gas ethanol, alkane, alkene Decolourize No decolourization Add KMnO 4 / H + alkene ethanol, alkane