The molarity of the potassium hydroxide solution is
So, you've got your balanced chemical equation for what is essentially a neutralization reaction
When you performed your titration and reached the equivalence point, you essentially added enough sulfuric acid to completely react with the potassium hydroxide solution, i.e. you've added enough protons to react will all the hydroxide ions and form water.
The volume and the concentration of the sulfuric acid solution will help you determine how many moles were needed to completely react with the potassium hydroxide.
Now look at the mole ratio that exists between
This means that, regardless of how many
SInce you had this many moles in your initial 70.0 mL volume, the concentration can only be