Question

In the gravimetric analysis of magnesium, when combusted to magnesium oxide, why should care be taken to collect all of the magnesium oxide is retained by the crucible?

Answer 1

Explanation:

.....the following reaction occurs.

Mg(s)+12O2(g)→MgO(s)+Δ

The magnesium oxide is a finely divided white solid, and CAN be lost during the exothermic combustion reaction. Nevertheless, given complete combustion (which is a given in these circumstances), the ratio of magnesium atoms to oxygen atoms will be 1:1 whatever mass of the combustion product you collect.

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