First, write the unbalanced equation:
It is simple to balance it:
(give the coefficient to
to balance
at the right side, then give the coefficient
to
to balance
and we are done).
Thus one mole of requires two moles of
to be neutralized.
Next, there are of
in
solution, therefore there are twice less moles of
This gives the molarity (molar concentration) of
to be equal to
This is the answer.
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