A weighed piece of magnesium ribbon is added to a dried crucible, which is reweighed and heated in air to form the compound MgO. The crucible is cooled and reweighed to find the mass of MgO. Which error could lead to a mass percentage of magnesium that is too low?

Question

Chemistry

Alyson Marshall

6 July, 09:15

A weighed piece of magnesium ribbon is added to a dried crucible, which is reweighed and heated in air to form the compound MgO. The crucible is cooled and reweighed to find the mass of MgO. Which error could lead to a mass percentage of magnesium that is too low?

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Answers (1)

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Wayne Thomas · Answer 1

One of the errors for low percentage of magnesium could be because not all the magnesium may have reacted.

Explanation:

During the heating process, if the magnesium have not reacted completely, it can lead to low percentage of magnesium in the oxide formed. The product may still look a bit greyish rather than whitish after the heating process.