Massing Mg Lab

Topics: Magnesium, Magnesium oxide, Oxygen Pages: 7 (1002 words) Published: May 3, 2014
Massing Magnesium Lab

Research Question/Aim

To understand the change in mass after burning magnesium and to also determine the chemical formula of magnesium oxide

Burning the magnesium will result in an increase in mass because the magnesium will react with oxygen in the air to make magnesium oxide

Independent- Initial mass of magnesium (Mg)
Dependent- Mass of the burnt magnesium (MgO)
Intensity of flame
Apparatus used (same crucible, Bunsen burner, tongs, electric balance) Duration of burning the crucible and magnesium
Size of magnesium ribbon (was about 10-11 cm long)


1. Goggles (eye protection)
2. Pair of metal tongs
3. Crucible (ceramic) with lid
4. Bunsen burner
5. Matches
6. Tripod
7. Pipe clay triangle
8. Heat resistant mat
9. Electric balance
10. Magnesium ribbon (x3)


Wear goggles to protect eyes
Wait for the crucible to cool off before touching it (the crucible after burning is very hot and may burn the skin) The person who moved the hot circle is responsible for informing others that it is hot Before touching the crucible, place hand near it to see if it is warm Tie hair up to avoid burning hair


1. Set up the heat resistant mat, Bunsen burner, tripod, and pipe clay triangle 2. Clean the crucible [with the lid] first by washing it under the tap 3. Dry the crucible by heating it with the Bunsen burner (will remove all the water) 4. After the crucible has cooled completely weigh the crucible [with the lid] on the electric balance and record it 5. Twist a piece of magnesium ribbon into a loose coil

6. Weigh the crucible with the magnesium inside it [with the lid] and record it. 7. Burn the magnesium with the lid placed slightly ajar to facilitate gas exchange when heating (since oxygen is required for this combustion reaction) 8. Burn the magnesium for a few minutes, making sure to check now and again by lifting the lid with the tongs to see if it has completely burnt 9. After the magnesium has turned into white ashes, remove the crucible carefully with tongs off the triangle and allow it to cool on the heat resistant mat 10. After the crucible has completely cooled, weigh it on the balance and record it 11. Repeat steps 2-10 two more times to ensure the recorded data are precise



Raw Data

Trial 1
Trial 2
Trial 3
Mass, g ± 0.01
Mass, g ± 0.01
Mass, g ± 0.01
Crucible + lid (after washing, heating/ drying)
32.23± 0.01 g
35.40 ± 0.01 g
35.21± 0.01 g
Crucible + lid +magnesium (before burning)
33.67± 0.01g
35.99 ± 0.01 g
35.98± 0.01 g
Crucible + lid + magnesium oxide (after burning)
33.94± 0.02g
36.07 ± 0.02 g
36.17± 0.02 g


Working out from the raw data the mass of Magnesium, Magnesium Oxide, and Oxygen:

Mass of:
Magnesium = (crucible + lid +magnesium) – (crucible + lid) Magnesium oxide = (crucible + lid + magnesium oxide) – (crucible + lid) Oxygen = (magnesium oxide) – (magnesium)

E.g. For trial 1,
Mass of magnesium (g) = 33.67-32.23= 1.44 g
Mass of magnesium oxide (g) = 33.94 – 32.23= 1.71 g
Mass of oxygen (g) = (mass of mg oxide) – (mass of mg)
= 1.71 – 1.44
= 0.27 g

Trial 1
Trial 2
Trial 3

Mass, g
Mass, g ± 0.01
Mass, g ± 0.01
1.44 ± 0.01
0.59 ± 0.01
0.77 ± 0.01
Magnesium oxide
1.71 ± 0.02
0.67 ± 0.02
0.96 ± 0.02
0.27 ± 0.01
0.08 ± 0.01
0.19 ± 0.01

Average Mass of Oxygen = ---------------------------- = 0.18 g

Average Mass of Magnesium =---------------------------= 0.93 g


The reaction (the oxidization of magnesium) is the burning of magnesium and the results show that the mass of magnesium increases after it has been burnt. The scientific reason for this is because the oxygen in the air bonds with the magnesium producing magnesium...
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Essay on Hcl + Mg Lab Report
  • Mg determination Lab report Essay
  • Mg and Hcl Lab Essay
  • sugar lab Essay
  • Chemistry Lab Essay
  • Lab report Essay
  • lab 10 Essay
  • Sunscreen Lab Essay

Become a StudyMode Member

Sign Up - It's Free