Question

A 25.00 mL sample of sulfuric acid, H2SO4, requires 42.13 mL of 0.1533 M NaOH for titration to the equivalence point. What is the molar concentration of the acid?
H2SO4 + 2 NaOH --> Na2SO4 + 2 H2O

Answer 1

molar concentration = \(\sf \frac{mol}{L}\) so get the moles of what you want, then divide by the volume given.

Answer 2

Convert volumes given in litres.
Calculate amount of substances of NaOH
n = c*V
Then you see amount of substances of acid is
One half of NaOH, because acid is diprotic..
Then calculate c(acid) = n(acid) / V( acid)