Page 482 - SUBSEC October 2017_Neat

02212032/CAPE/SPEC/MS/2017
- 4 –

CHEMISTRY
UNIT 2 — PAPER 032
MARK SCHEME
KC UK XS

 95.2 
(v) % purity =  x 100  = 29.5% [1 mark] 1
 10 

Steps

Dissolve the 10g of FeSO4 in minimum volume of H2SO4 in a
beaker.
Transfer quantitatively to a 1 dm volumetric flask.
3
(b) Make up to mark with distilled water.
Stopper and shake/invert to ensure thorough mixing.
[4 marks]

It is oxidised in air from Fe to Fe 3+. [2 marks]
2+
(c)

5 10
Total 15 marks