Investigating Hydrated Crystals.

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Hydrated Crystals

Our unknown sample is Unknown A, which is theoretically CuSO4 .5H2O.

Table 1: Raw Data

Quantitative Observations

Mass (g)

Uncertainties

Mass of crucible

45.74

± 0.02

Mass of crucible + 3g of hydrated salt

48.72

± 0.02

Mass of hydrated salt

2.98

± 0.04

Mass of crucible and contents after heating #1

47.97

± 0.02

Mass of crucible and contents after heating #2

47.88

± 0.02

Mass of crucible and contents after heating #3

47.77

± 0.02

Mass of crucible and contents after heating #4

47.75

± 0.02

Mass of anhydrous salt

47.75

± 0.02

Qualitative Observations:

When the beaker was covering the evaporating basin on the hot place, it had water vapour lined on its inside.

The colour of the salt becomes lighter - from blue crystals and a mixture of lighter blue and white crystals.

The texture after the heating appeared to look like ash, suggesting that it was dryer.

Questions:

(a) Calculate the mass of water in the