Supporting Practical Science, D&T and Art
Investigating iron chemistry (2)
- in schools and colleges
8. Add 3 drops of
Na2S2O3(aq) to each
black-ringed circle.
Observe carefully.
9. 2 drops of the mixture from
either circle from step 8. Add
2 drops of NaOH(aq).
1. Put 2-3 pieces of Mg in
the circle.
Is the Mg magnetic?
2. Add 2 drops of solution A
– observe for a few seconds.
Slide a magnet up to the Petri
dish (i.e. where the arrow is).
3. 1 drop of solution A.
Add 2 drops of NaOH(aq).
7. Put 1 drop of Cu2+(aq)
into the centre circle.
Dip a cocktail stick in it
and use the dipped end
to stir this drop only.
Cu2+(aq)
6. 1 drop of solution B in
each black-ringed circle.
· Solution A = iron(II), Fe2+(aq), 0.1 M
· Solution B = iron(III), Fe3+(aq), 0.1 M
ASE 01/14_DRAFT
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4. 1 drop of solution A.
Add 3 drops of H2O2(aq).
Wait for 5-10 seconds.
Add 2 drops of NaOH(aq)
5. 1 drop of solution B.
Add 2 drops of NaOH(aq)
· copper(II), Cu2+(aq), < 0.1 M
· hydrochloric acid, HCl(aq), 1 M
· hydrogen peroxide, H2O2(aq), 20 ‘vol’ [IRRITANT]
· sodium hydroxide, NaOH(aq), 0.4 M [IRRITANT]
· sodium thiosulfate, Na2S2O3(aq), 0.1 M
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