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• Level: GCSE
• Subject: Maths
• Word count: 1048

# Calamine Investigation

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Introduction

## Calamine Investigation

Introduction.

Calamine is a mineral containing Zinc Carbonate (Zn CO ). On heating it decomposes as follows:

ZnCO  -------ZnO+ CO

(C= 12, O= 16, Zn= 65)

The equation allows you to calculate a theoretical conversion of calamine into zinc oxide. In the chemical industry they need to be able to calculate % yields in order to make sure that their processes are economical.

Aim.

I am going to compare the results from the experiment with the theoretical result to see if they have any similarities or differences.

I have already been told how to find out the theoretical result by using balanced equations and reacting masses.

Prediction.

I predict that the experimental yield won’t be the same as the theoretical yield.

This is because the experiments weren’t as accurate as they could have been. My measurements of zinc carbonate weren’t as accurate as they needed to be, to ensure a fair test. This was because it is almost impossible to weigh exact measurements on electronic scales.

Middle

4

29.88

33.85

32.80

2.92

5

31.53

36.48

35.32

3.79

Experiment 2

 Amount of zinc carbonate(g) Weight of tube and wool (g) Weight of tube, wool and zinc carbonate (g) Weight of zinc oxide, wool and tube (g) Total weight lose 1 16.41 17.92 17.04 0.63 2 16.42 18.22 17.78 1.36 3 30.65 33.83 33.01 2.36 4 31.92 35.88 34.80 2.88 5 30.52 35.48 34.51 3.99

Experiment 3

 Amount of zinc carbonate(g) Weight of tube and wool (g) Weight of tube, wool and zinc carbonate

Conclusion

To improve the experiment, I would have to check test tubes for any moisture, as this was a key factor as to what may have possibly gone wrong with the experiment. I would also have to measure out the zinc carbonate with more accuracy because this is another factor within the experiment to make it variable.

If I was to repeat the experiment I would give myself a lot more time to measure because in this experiment we ran very close to the end of the time we had. Also I would measure the zinc carbonate with more accuracy.

This student written piece of work is one of many that can be found in our GCSE Height and Weight of Pupils and other Mayfield High School investigations section.

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1. ## Obtaining Zinc Oxide from calamine.

Theoretical Amounts Amounts Formula: ZnCO3 ZnO + CO2 C=12 O=16 Zn=65 ZnCO3 ZnO + Co2 RFM 125g 81g 44g 0.5g = 81/125 x 0.5 = 0.65 x 0.5 = 0.32g 1.0g = 81/125 x 1.0 = 0.65 x 1.0 = 0.65g 1.5g = 81/125 x 1.5 = 0.65 x 1.5

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To compare the theoretical conversion chart with the results I gained I will work the percentage yield. This is done by taking the actual amount gained dividing it by the expected amount (theoretical) and times by 100. Here are the percentage yields I worked out.

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