DRAFT: This module has unpublished changes.

Data

 

 

Table 1: Mass of empty crucible

Measurement

Mass (g)

Crucible and lid before heating

38.355g

After first heating

38.348g

 

 Table 2: Mass of crucible and sample

Measurement

Mass (g)

Crucible, lid, and precipitate before heating

45.167g

Crucible, lid, and precipitate after first heating

39.350g

Crucible, lid, and precipitate after second heating

39.344g

 

Table 3: Determination of the amount of sulfate in the unknown

Parameter

Value

Mass of unknown sample (g)

0.6130g

Mass of crucible and lid (g)

38.342g

Mass of crucible, lid, and precipitate (g)

39.344g

Mass of precipitate (g)

1.002g

Number of moles of precipitate (mol)

0.00429mol

Number of moles of SO4 in precipitate (mol)

0.00429mol

Mass of SO4 in precipitate (g)

0.422g

Percent SO4 in precipitate (%)

68.8%

 

Table 4: Possible unknowns

Formula

Formula Weight

(g/mol)

 Content

(%)

Solubility in Water

 Li2SO4

109.98

87.4%

Yes

 Na2SO4

142.08

67.6%

Yes

 Na2SO4*H2O

160.1

60.0%

Yes

 K2SO4

174.3

55.1%

Yes

 CaSO4

136.18

70.6%

No

 MgSO4

120.41

79.8%

Yes

 SrSO4

183.72

52.3%

No

DRAFT: This module has unpublished changes.