Oxide Reactions - Online Tutor, Practice Problems & Exam Prep
Topic summary
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Oxides, peroxides, and superoxides of groups 1a and 2a are reactive compounds.
These compounds react with water to produce hydroxides, which are basic in nature.
They also react with acids to produce salts and water.
An example reaction is lithium oxide with water forming lithium hydroxide, a base, requiring a stoichiometric balance with a coefficient of 2 for water.
Another example is calcium oxide reacting with hydrochloric acid to form calcium chloride (a salt) and water, with a stoichiometric balance using a coefficient of 2 for hydrochloric acid.
1
concept
Oxide Reactions
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58s
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Video transcript
We can say that oxides, peroxides and superoxides are groups. 1A and 2A are reactive compounds. Now they can react with water to produce hydroxides which are basic in nature and they react with acids to produce salts and water.
If we take a look here, if we have a reacting with water, we have lithium oxide reacting with liquid water, it produces lithium hydroxide base. We put a 2 here to balance it out reacting with acids. Here we have calcium oxide solid reacting with hydrochloric acid that produces our salt in the form of calcium chloride and liquid water.
To balance this we put a 2 with the hydrochloric acid. So just remember when it comes to these oxides, we can react them with water to create bases as a product or it can react them with acids to create water and an ionic compound called a salt.
Li
2
O
(
s
)
+
H
2
O
(
l
)
→
Li
2
OH
(
aq
)
Ca
O
(
s
)
+
2
H
Cl
(
aq
)
→
Ca
Cl
(
aq
)
+
H
2
O
(
l
)
2
example
Oxide Reactions Example
Video duration:
59s
Play a video:
Video transcript
Here it's just complete and balanced the following equation. Here we have lithium oxide reactant with hydrochloric acid. We know that when we're reacting with an acid we're going to create water and a salt.
So here lithium oxide is composed of lithium ion and the oxide ion hydrochloric acid is made-up of H plus ion and chloride ion. The lithium and chlorine chloride will combine together to give us our salt. So lithium chloride its aqueous. The oxide and the hydronium ion H combine to give us our liquid water.
To balance this, we need to put a 2 here so that both sides have two lithiums. But now we have 2 chlorines on the product side, so I put a 2 here. This here would represent our balanced overall equation between the reaction of lithium oxide solid and hydrochloric acid.
Li
_
2
O
(
s
)
+
2
HCl
(
aq
)
→
2
LiCl
(
aq
)
+
H
_
2
O
(
l
)
3
Problem
Problem
Write a balanced equation to show what happens when strontium oxide dissolves in water.
A
Sr2O3(s) + 3 H2O(l) → 2 Sr(OH)3(aq)
B
SrO(s) + H2O(l) → Sr(OH)2(aq)
C
SrO2(s) + 2 H2O(l) → Sr(OH)4(aq)
D
Sr2O(s) + H2O(l) → 2 SrOH(aq)
4
Problem
Problem
Write a balanced equation for the reaction of magnesium oxide with aqueous hydrochloric acid.
