Page 471 - SUBSEC October 2017_Neat
P. 471
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TABLE 1: DATA FOR EXPERIMENTAL PROCEDURE
STEP DATA
A Initial mass of Sample A in crucible, M1. ...........................
Change in appearance of Sample A. .............................
B ........................................................................................
.........................................................................................
C Mass of Sample A in crucible after the first heating
process, M2. .....................................................................
D Colour of mixture. ...........................................................
Colour of filtrate obtained from washing residue:
E first washing ..............................................................
second washing ...........................................................
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Change in appearance of sand..........................................
F
..........................................................................................
G Mass of dried residue and crucible, M3...........................
[10 marks]
(b) Determine EACH of the following:
(i) The mass of the water of crystallization in CuSO .n H O
2
4
................................................................................................................................
................................................................................................................................
...............................................................................................................................
[1 mark]
(ii) The mass of anhydrous copper sulphate
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.................................................................................................................................
.................................................................................................................................
................................................................................................................................
[1 mark]
(iii) The value of n
.................................................................................................................................
.................................................................................................................................
................................................................................................................................
[3 marks]
Total 15 marks
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