Analysis of Hydrated copper sulphate

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Ayush Gupta

Chemistry Standard Level

May 2013 session

Internal Assessment

Lab report

ANALYSIS OF HYDRATE COPPER SULPHATE.

- Ayush Gupta.


Aim

To determine the molecular formula of hydrated copper sulfate.

Requirements

Hydrous copper sulfate

Electronic balance

Evaporating dish

Glass rod

Tripod stand

Bunsen burner

Crucible

Procedure

First I weighed 3g of hydrous copper sulfate on electronic balance and began heating it in an evaporating dish on top of a Bunsen burner. After the reaction was complete I measured the new weight to find a change in mass.

Qualitative data –

After the reaction was complete, the colour changed from blue to white due to a loss of water crystals.

Faint green tinge became evident and fine white powder was formed from crystals. Continued heating led to formation of oliver green colour.

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Quantitative data –

Original weight of hydrous copper sulfate – 3g

         Error in electronic balance - ± 0.001g   (provided by the teacher)

        

        Data collection –

        

        

Data Processing –

To minimize the errors I conducted three trials and averaged the readings to find a more accurate answer.

                                                          = 1.93 g ± 0.001

Change in mass = (3 ± 0.001) – (1.93 ± 0.001)

                  = 1.07 ± 0.002

The change in mass was due to the loss of water crystals. Water (H20) has a molar mass of 18g. Therefore the change in mass must ...

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