lab chemistry discussion.

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Create a graph showing the solubility of potassium aluminum sulfate as a function of temperature NOTE: See second tab for Results and Calcuations Chemistry 147 Data Template Synthesis Instructions: Data goes in yellow boxes; for results, complete calculations in blue. Lab Section Group Members Rajeh ali dayshan Synthesis Name Mass Al Mass Product Rajeh/dayshan ali 1 1.072 12.459 39.229 Theoretical Yield 9.59525574 10.2861142 % Yield 129.84542 381.37823 Characterization Density Determination - Standard Name Mass Volume 153 0.0001 Density 1530000 Density Determination - Sample Name Mass g rajeh/ dayshan 7.297 ali 1.53 Volume ml 3.5 0.0001 Density g/ml 2.08485714 15300 Melting Point Determination Name Standard Start C rajeh/ dayshan 46.8 ali 23 Stop C 91.1 82 Sample Start C 22.7 23 pH Determination Name Standard Sample rajeh/ dayshan ali 1 4 4 4 Physical Characteristics Name Standard Sample rajeh/ dayshan ali white paste/ solid white paste/ solid white powder white powder Stop C 73.6 82
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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, ...


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