Calculate the molar concentration of a solution of nitric acid if 20.00 mL of the acid requires12.63 mL of 0.155 M NaOH to reach the equivalence point.

Answer 1

HNO3 + NaOH ==> NaNO3 + H2O
mols NaOH = M x L = ?
mols HNO3 = mols NaOH (Note 1 mol HNO3 = 1 mol NaOH in the balanced equation)
Then M HNO3 = mols HNO3/L HNO3