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?

Md Ariful Islam

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Md Ariful Islam

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.....the following reaction occurs.

$Mg(s) + 1/2O_2(g) rarr MgO(s)+Delta$

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. And thus $"option D"$ is the winner.

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