Magnesium carbonate reacts with nitric acid.
MgCO₃(s) + 2HNO₃(aq) → Mg(NO₃)₂(aq) + H₂O(l) + CO₂(g)
0·05 mol of magnesium carbonate was added to a solution containi... show full transcript
Worked Solution & Example Answer:Magnesium carbonate reacts with nitric acid - Scottish Highers Chemistry - Question 15 - 2019
Step 1
A 0·05 mol of carbon dioxide is produced
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Answer
This statement is true. During the reaction, one mole of magnesium carbonate produces one mole of carbon dioxide. Hence, 0·05 mol of magnesium carbonate will produce 0·05 mol of carbon dioxide.
Step 2
B 0·06 mol of magnesium nitrate is produced
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This statement is misleading. The reaction produces 0·025 mol of magnesium nitrate since only 0·05 mol of magnesium carbonate is present, and the stoichiometry of the reaction indicates that 1 mole of MgCO₃ produces 1 mole of Mg(NO₃)₂.
Step 3
C Magnesium carbonate is in excess by 0·02 mol
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Answer
This statement is true. The reaction requires 0·1 mol HNO₃ for 0·05 mol MgCO₃, but only 0·06 mol of HNO₃ is present, leaving 0·02 mol of MgCO₃ unreacted.
Step 4
D Nitric acid is in excess by 0·01 mol
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Answer
This statement is false. Nitric acid is actually in deficit, as it needs 0·1 mol to react completely with 0·05 mol of magnesium carbonate.
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