How do you predict the products of H2SO4 + NaOH?
Answers
Answer:
In order to predict what the products of a chemical reaction will be you must first be familiar with the six types of chemical reactions: synthesis, decomposition, single replacement, double replacement, acid-base, and combustion.
I can't walk you through all of them since it would make for a very, very long answer; however, I'll show you in detail the example you have.
Each of these reaction types has typical characteristics that allow you to figure out what the products of the reaction will be. For example, the reaction you've chosen is an acid-base reaction (also known as a neutralization reaction).
In this particular case, a strong acid,
H
2
SO
4
, reacts with a strong base,
NaOH
, to produce salt and water.
H
2
S
O
4
(
a
q
)
+
2
N
a
O
H
(
a
q
)
→
N
a
2
S
O
4
(
a
q
)
+
2
H
2
O
(
l
)
For this type of reaction you must also be familiar with complete and net ionic equations. Make sure that you understand what the
(aq)
,
(s)
,
(g)
, and
(l)
symbols means, since they play an important part in understanding what happens in a reaction.
In this case, the reaction takes place in aqueous solution, hence the
(aq)
symbols. When placed in solution, strong acids and bases will dissociate into cations and anions, like this:
2
H
+
(
a
q
)
+
S
O
2
−
4
(
a
q
)
+
2
N
a
+
(
a
q
)
+
2
O
H
−
(
a
q
)
→
2
N
a
+
(
a
q
)
+
S
O
2
−
4
(
a
q
)
+
2
H
2
O
(
l
)
This represent the complete ionic equation. If you eliminate the spectator ions, i.e. the ions present on both sides of the reaction, you'll get the net ionic equation
H
+
(
a
q
)
+
O
H
−
(
a
q
)
→
H
2
O
(
l
)
As a conclusion, you must become familiar with the various types of chemical reactions if you wish to be able to say what the products of a reaction are.