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# Finding the Empirical Formula of Magnesium Oxide

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Introduction

IGCSE Practical Assessment-Finding the Empirical Formula of Magnesium Oxide Appearance of Magnesium before experiment: The magnesium was silvery and curly in a solid form before heated. Appearance of Magnesium during experiment: There was fizzing white smoke (Magnesium Oxide) coming out from the crucible when we lifted the lid to let oxygen in, it has no smell. Appearance of Magnesium after experiment: The magnesium turned in a white power form after heated. ...read more.

Middle

+ lid + magnesium oxide after heating =30.81g Mass of crucible + lid + magnesium before heating =30.69 Therefore, the mass of oxygen in magnesium oxide =0.12g Change the masses into moles Magnesium Oxygen 0.4 0.12 24 16 =0.0166 mole =0.0075 mole The ratio of moles of each element Mg : O 0.0166 : 0.0075 2 : 1 Therefore, the formula of magnesium oxide is Mg�O. ...read more.

Conclusion

I presume that mistakes happened when I lifted the lid up frequently to let oxygen in. The distance that I lifted it maybe more than I was supposed to; in other words, I had a high possibility of lifting the lid away from the crucible longer, which meant that there was more time for magnesium oxide to escape from the crucible. I would ameliorate the experiment next time with counting the appropriate timing and measuring the distance of lifting the lid, in order to keep the experiment fair and to the accurate figure. By Heidi Chow 10Y ...read more.

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