Investigating Hydrated Crystals.

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Justin Yeo        Chemistry                                         Dr Badran

Hydrated Crystals

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

Table 1: Raw Data

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.

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


  1. Calculate the mass of water in the hydrate.

Total mass of water: Weight before heating – Weight after heating #4

48.72 ± 0.02 – 47.75 ± 0.02 = 0.97g

Uncertainty of mass of water in hydrated salt:

0.02 + 0.02 = 0.04


Total mass of water = 0.97 ± 0.04

  1. Compare the number of the anhydrous compound to the number of moles of water in the hydrate and use ...

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