how many moles of hno3 are present if 270102 was needed to n

how many moles of hno3 are present if 2.70*10^-2 was needed to neutralize the acid solution?

Solution

moles of HNO3=moles of H+

but H+ +OH- ----H2O

so moles of OH- =2.7*10^-2

so moles of HNO3=2.7*10^-2