First, let's look at this question using 2.1 x M HCl instead of
. HCl is a strong acid. This means that it will disassociate completely in water:
+
->
+
Therefore, all of the hydrogen ions in HCl will be converted into hydronium ions ( ). Since there is a 1:1 ratio of HCl used and
produced, the concentration of HCl and the concentration of
will be the same, 2.1 x
M.
Now, let's look at what happens when we use 2.1 x
.
is also a strong acid and will disassociate completely in water; however,
has two H atoms instead of just one. This means that we will need to react two molecules of
with every one molecule of
:
+
->
+
Since this reaction results in the production of two molecules for every one
molecules, the concentration of hydronium ions (
) will be twice the concentration of the
.
2 x (2.1 x M) = 4.2 x
M
.
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