A 25.00 mL sample of NaOH is titrated with 45.5 mL of 0.100 M H_{2}SO_{4}(aq). What is the concentration of the NaOH solution?

a. 0.091 M

b. 0.182 M

c. 0.364 M

d. 0.455 M

e. 0.728 M

We’re being asked to find the concentration of NaOH that is titrated with 45.5 mL 0.100 M H_{2}SO_{4}.

**Let’s first write the balanced reaction between H _{2}SO_{4} and NaOH:**

**Reactants:**

• **H _{2}SO_{4}**

▪ oxyacid → 2 more oxygens than hydrogens → *strong oxyacid*

▪ a strong acid → will completely dissociate in solution

▪ **H _{2}SO_{4(aq)} → 2 H^{+}_{(aq)} + SO_{4}^{2-}_{(aq)} **

• Na**OH**

Equivalence Point