Question

A solution of 2.5 M h2so4 is reacted with 75.0 mL of 6.2 M NaOH. Calculate the volume of h2so4 required in milliliters.

Answer 1

First I assume the point is to use up all the NaOH.

1. Find moles of NaOH that you have equation:
Molarity = moles/Liters
Note:
1L = 1000mL

2. Determine the reaction equation Hint one of the products is H2O because it is an acid base reaction

3. Balance that reaction equation

4. Using the balanced equation figure out how many moles of H2SO4 you need by using the moles of NaOH determined in step 1.

5. Sub the moles of H2SO4 and concentration into the formula:

Molarity = moles/liters

to find liters

You have your answer.

Answer 2

H2SO4 + 2 NaOH → Na2SO4 + 2 H2O

(75.0 mL) x (6.2 M NaOH) x (1 mol H2SO4 / 2 mol NaOH) / (2.5 M H2SO4) =
93 mL H2SO4