In a titration a 15.00 cm3
sample of H2SO4 required 36.42 cm3
of 0.147 mol dm–3 NaOH solution for
complete neutralization. What is the concentration of the H2SO4?
answer-0.178 mol dm−3

for this question i tried, c1v1=c2v2, i did not get the answer

you are correct to use C1V1=C2V2
but H2SO4 is a diprotic acid so it will be neutralised by two times it’s concentration
2 * C1V1=C2V2
2 * C1 * 15 * 10⁻³ = 0,147 * 36,42 * 10⁻³
C1 = 0,35/2 = 0,17