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FINDING THE EMPIRICAL FORMULA

BY MICHAEL XIOUROUPPAS 5A

Procedure :

You are using the first person please use passive voice.

1)we had to heat our crucible for 5 mins

2)we weighted our crucible after it cooled down with the lid and with no magnesium

3)We weighted our crucible again with the lid but with the magnesium this time

4)We had to heat our crucible again with the magnesium and the lid for 15 mins

5)After it cooled down we weighted the crucible wrote down our results that are shown below

Item Mass/g(0.01)

Empty crucible+ lid 21.62

Crucible + lid + Mg before heating 21.86

Crucible+ lid + Mg heated 22.02

Observations : smoke coming out of the crucible while heating with the Mg also white light

when I opened the lid just to check if it was ready.

moles of Mg =

=0.009Mg

Mr of Mg = 24.31

Element Mass/g (0.02) Moles

Magnesium 21.86-21.62

=

Oxygen 22.02-21.86

=

Ratio we have is 1:1

The equation we get in the end is Mg + O2 =MgO

we have to balance it and we get 2Mg +O2 =2MgO

Conclusion: For the result to be right we had to have a ratio of 1:1 with the experiment that we

did with the magnesium hopefully I found 0.24 that was the magnesium and I found the oxygen

to be 0.16 that made my experiment I got it right and found 1:1 ratio.

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Materials : we use our protecting goggles and we use a Bunsen burner and a tripod so we can

put our crucible on it.

Evaluation : I had no problems with my experiment as it seems I got the results I was looking for

but if there was a problem and my products had bonded with nitrogen I had heat the products

in my crucible with water so ammonia would dissolve and then start the procedure from the

start to get the results I would want.

There are 12 marks available for this report but this merits 4. Please rethink your report and

look in the book the section on internal assessment and resubmit.