Chemistry Essay

308 WordsAug 23, 20112 Pages
Activity 3.5 Laboratory work Page 25 Aim: To determine the empirical formula of magnesium oxide Apparatus: Crucible with lid, tongs, Bunsen burner, tripod stand, pipe-clay triangle. Materials: 10 cm magnesium ribbon, sandpaper. Procedure: 1. Weigh a crucible and its lid. 2. Clean the magnesium ribbon with sandpaper. 3. Coil the ribbon and place it in the crucible. Weigh the crucible with its lid and the content in it. 4. Set up the apparatus as shown in Figure 3.3. [pic] 5. First, heat the crucible without its lid, with a strong flame. 6. When the magnesium ribbon starts to burn, cover the crucible with its lid. 7. Using a pair of tongs, carefully raise the lid a little, at intervals. 8. When the burning is complete, remove the lid and heat the crucible strongly for 1 or 2 minutes. 9. Allow the crucible to cool to room temperature with its lid still on. 10. Weigh the crucible with its lid and the content again. 11. Repeat the process of heating, cooling and weighing until a constant mass is obtained. Record the constant mass obtained. Observation: |Observation |Inference | | | | |1 ……………………………………. released. |……………………………………...is formed. | | | | |2 . | | Data: |Description

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