Question

if 24.25 mL of a standard M NaOH solution is required to neutralize 26.00 mL of H2SO4, what is the molarity of the acid solution?

Answer 1

You have to know the concentration of the NaOH solution.

Answer 2

Lets say that the NaOH solution is X M.

Number of millimoles of NAOH used is
24.25 x X

each millimole of NaOH neutralises half a millimole of H2SO4

so number of millimoles of H2SO4 is
24.25 x X x 0.5

if C (in mole per litre) is the concentration of H2SO4 then

26.00 x C = 24.24 x X x 0.5

so
C = 24.24 x X x 0.5/26.00

and you can find C when you know X