ideavova.blogg.se - Metal ion reactivity series

Clamp the electrodes so that they dip into the copper(II) sulfate solution and connect up the rest of the circuit as shown in the diagram, with the power supply switched off.

Half-fill the 100 cm 3 beaker with the copper(II) sulfate solution.

Stop heating and carefully transfer the beaker onto a heat resistant mat.

Half-fill the 250 cm 3 beaker with water, and heat with a Bunsen burner until boiling.

The mixed solution at this concentration should be labelled TOXIC.Īfter electrolysis, the electrodes can be removed and used to test for discharged metal cations Procedure

If required, to test for zinc in the presence of copper (see teaching notes), the solution containing mercury(II) chloride and ammonium thiocyanate can be prepared by dissolving 2.7 g of mercury(II) chloride and 3 g of ammonium thiocyanate in 100 cm 3 of water.Platinum electrodes work best – alternatives include graphite.Ammonium thiocyanate, NH 4SCN(s), (HARMFUL) – see CLEAPSS Hazcard HC009B and CLEAPSS Recipe Book RB122.Mercury(II) chloride, HgCl 2(s), (VERY TOXIC, DANGEROUS FOR THE ENVIRONMENT) – see CLEAPSS Hazcard HC062 and CLEAPSS Recipe Book RB057.Aqueous ammonia, NH 3(aq), (IRRITANT at concentration used) – see CLEAPSS Hazcard HC006 and CLEAPSS Recipe Book RB006.Aqueous nitric acid, HNO 3(aq), (CORROSIVE) – see CLEAPSS Hazcard HC067 and CLEAPSS Recipe Book RB061.Zinc sulfate solution, ZnSO 4(aq), (IRRITANT, DANGEROUS FOR THE ENVIRONMENT) – see CLEAPSS Hazcard HC108b and CLEAPSS Recipe Book RB106.Iron(II) sulfate solution, FeSO 4(aq) – see CLEAPSS Hazcard HC055B and CLEAPSS Recipe Book RB051.Copper(II) sulfate solution, CuSO 4(aq) – see CLEAPSS Hazcard HC027c and CLEAPSS Recipe Book RB031.Wear eye protection (goggles) throughout.Read our standard health and safety guidance.(Optional) Solution of mercury(II) chloride (VERY TOXIC) mixed with ammonium thiocyanate (HARMFUL) (see note 11 below).Aqueous ammonia, about 4 M (IRRITANT), 10 cm 3.

Nitric acid, about 4 M (CORROSIVE), 20 cm 3.Zinc sulfate, about 0.5 M, 200 cm 3 (IRRITANT, DANGEROUS FOR THE ENVIRONMENT).Iron(II) sulfate, about 0.5 M, 200 cm 3.

Copper(II) sulfate, about 0.5 M, 200 cm 3.Several lengths of connecting wire, including two fitted with crocodile clips.Platinum electrodes, 1 cm square, with platinum leads sealed through glass tubes, both supported in a rubber bung or cork so that the electrodes are about 2 cm apart, x2 (see note 10 below).It is probably best to assign two metal ions and one mixture to each group, and pool the results from all the groups. There is probably insufficient time for each group to do all six electrolyses. This experiment is best done by students working in groups of two or three. They then carry out a similar procedure using mixtures of these electrolytes, in order to find out which ion is discharged in preference to the other. In this experiment, students electrolyse copper(II) sulfate, iron(II) sulfate and zinc sulfate solutions, before testing for any metal deposited at the electrodes. RSC Yusuf Hamied Inspirational Science Programme.Introductory maths for higher education.The physics of restoration and conservation.