
The following are two reaction schemes involving magnesium. Scheme I: When magnesium burns in oxygen, a white solid (A) is formed. A dissolves in 1 M HCl to give a colorless solution (B). Upon addition of Na2CO3 to B, a white precipitate is formed (C). On heating, C decomposes to D and a colorless gas is generated (E). When E is passed through limewater [an aqueous suspension of Ca(OH)2], a white precipitate appears (F). Scheme II: Magnesium reacts with 1 M H2SO4 to produce a colorless solution (G). Treating G with an excess of NaOH produces a white precipitate (H). H dissolves m 1 M HNO3 to form a colorless solution. When the solution is slowly evaporated, a white solid (I) appears. On heating I, a brown gas is given off. Identify A–I, and write equations representing the reactions involved.

Interpretation:
The equations representing A-I involved reactions has to be written.
Concept introduction:
- To write a chemical reaction from the given information we must understand which is going to react and which is going to form as product in a particular chemical reaction.
- First write down the reactants in left side and analyze carefully the possibility of product obtained and this has to be placed in right side of a reaction.
- We can represent a reaction by writing reactants in left side and products in the right side.
Explanation of Solution
To identify A in the reaction of
2 moles of magnesium reacts with 1 mole of oxygen to produce 2 moles of magnesium oxide in solid form and the reaction scheme has to be represented as follows
A=
To identify B in the reaction of
1 mole of magnesium oxide reacts with 2 moles of hydrogen chloride to produce 1 mole of magnesium chloride in aqueous form and the reaction scheme has to be represented as follows
B=
To identify C in the reaction of
1 mole of magnesium chloride reacts with 1 mole of sodium carbonate to produce 1 mole of magnesium carbonate in solid form and 2 moles of sodium chloride and the reaction scheme has to be represented as follows
C=
To identify D in the reaction of
On heating, magnesium carbonate decomposed into magnesium oxide and carbon dioxide and the reaction has to be represented as follows
D =
To identify F in the reaction of
Carbon dioxide reacts with calcium hydroxide to produce calcium carbonate and water and the reaction has to be represented as follows
F =
To identify G in the reaction of
Magnesium reacts with sulfuric acid to produce magnesium sulfate and hydrogen gas and the reaction is represented as follows
G =
To identify H in the reaction of
Magnesium sulfate reacts with sodium hydroxide to produce magnesium hydroxide and sodium sulfate and the reaction has to be represented as follows
H=
To identify I in the reaction of
Magnesium hydroxide reacts with nitric acid to produce magnesium nitrate and water after evaporation and the reaction is represented as follows
I =
And
The equations representing A-I involved reactions was identified.
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Chapter 21 Solutions
Chemistry Atoms First, Second Edition
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