magnesium carbonate + hydrochloric acid → magnesium chloride + carbon dioxide + water
1) If the mass of the products of the reaction above was 45kg, what was the mass of the reactants?
2) When magnesium reacts with sulfuric acid the products are magnesium sulfate and hydrogen.
If there are 15g of magnesium at the start of the reaction how much magnesium will be present in the magnesium sulfate
3) Explain what is meant by 'conservation of mass'
Answers
Explanation:
Magnesium reacts with dilute hydrochloric acid in a conical flask which is connected to an inverted measuring cylinder in a trough of water. The volume of hydrogen gas produced is measured over a few minutes, and the results are used to plot a graph
This is intended as a class practical. It is best if the students work in pairs because setting up and starting the experiment requires more than one pair of hands. One student can add the magnesium ribbon to the acid and stopper the flask, while the other starts the stopclock. During the experiment, one student can take the readings while the other records them. The experiment itself takes only a few minutes. But allow at least 30 minutes to give students time to set up, take readings and draw graph.
Hydrogen gas (extremely flammable) is generated in the experiment. Students should not have access to any source of ignition.
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