Question

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determine the chemical formula of each of the hydrates.

cobalt(ii) bromide hexahydrate:

sodium carbonate decahydrate:

magnesium sulfate heptahydrate:

Explanation:

Identify cobalt(II) bromide hexahydrate

Determine the ionic formula first.
Cobalt(II) represents \(\text{Co}^{2+}\).
Bromide represents \(\text{Br}^-\).
Balancing charges gives \(\text{CoBr}_2\).
Hexahydrate indicates six water molecules.
The formula is \(\text{CoBr}_2 \cdot 6\text{H}_2\text{O}\).

Identify sodium carbonate decahydrate

Determine the ionic formula first.
Sodium represents \(\text{Na}^+\).
Carbonate represents \(\text{CO}_3^{2-}\).
Balancing charges gives \(\text{Na}_2\text{CO}_3\).
Decahydrate indicates ten water molecules.
The formula is \(\text{Na}_2\text{CO}_3 \cdot 10\text{H}_2\text{O}\).

Identify magnesium sulfate heptahydrate

Determine the ionic formula first.
Magnesium represents \(\text{Mg}^{2+}\).
Sulfate represents \(\text{SO}_4^{2-}\).
Balancing charges gives \(\text{MgSO}_4\).
Heptahydrate indicates seven water molecules.
The formula is \(\text{MgSO}_4 \cdot 7\text{H}_2\text{O}\).

Answer:

Determine the chemical formula of each of the hydrates.

Question 1

cobalt(II) bromide hexahydrate: <blank>\(\text{CoBr}_2 \cdot 6\text{H}_2\text{O}\)</blank>

Question 2

sodium carbonate decahydrate: <blank>\(\text{Na}_2\text{CO}_3 \cdot 10\text{H}_2\text{O}\)</blank>

Question 3

magnesium sulfate heptahydrate: <blank>\(\text{MgSO}_4 \cdot 7\text{H}_2\text{O}\)</blank>