Experimental work (6) Answers

IB Chemistry: Experimental work (6) Answers

6. (a) Amount of magnesium = 0.196 ÷ 24.31 = 8.063 x 10−3 molAmount of oxygen = (0.299 − 0.196) ÷ 16.00 = 6.438 x 10−3 mol(8.063 x 10−3) ÷ (6.438 x 10−3) = 1.25 so simplest ratio for Mg:O is 5:4. [1](b) Add a few drops of dilute hydrochloric acid and test to see whether hydrogen gas is evolved. [1](Note that both Mg and MgO react with hydrochloric acid but only magnesium gives hydrogen as a product. The...

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