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Explanation & Answer
Attached.
Discussion
a. Claim: potassium aluminum sulfate dodecahydrate was produced.
b. Table: Results
Name
Percent
yield (%)
72
Density(g/ml) Melting
point
1.53
92
pH
Appearance
4
Rajeh/Dayshan 129.85
2.085
73.6
1
Ali
381.38
15300
82
4
White
powder
White
paste/solid
White
paste/solid
I.
Discussion of results
Standard
2Al(s) + 2KOH(aq) + 6H2 O → 2KAl(OH)4(aq) + 3H2(aq)
2KAl(OH)4(aq) + H2 SO4(aq) → 2Al(OH)3(s) + K 2 SO4(aq) + 2H2 O(l)
2Al(OH)3(s) + K 2 SO4(aq) + 3H2 SO4(aq) → 2KAl(SO4 )2(aq) + 6H2 O(l)
2KAl(SO4 )2(aq) + 24H2 O(l) → 2KAl(SO4 )2 . 12H2 O(s)
Finally, a white paste was obtained. It is the potassium aluminum sulfate dodecahydrate. So,
there are evidences to support the claim as standard sample is a white powder, and literature also
says that it is a white color powder/paste or a solid.
Melting point is around 73 to 82 here. In standard sample, ...