Question

How many milliliters of a solution that is 10.25% HNO3 (w/w) with a density of 1.2792g/mL should be diluted in order to make 5.00L of a .250M HNO3 solution?

Answer 1

Molarity(M) = (w/w%)*d*10/Mwt

                  mwt = molarmass of HNO3 = 63 g/mol

                   = 10.25*1.2792*10/63

                   = 2.08 M

so that,

M1V1 =M2V2

M1 = 2.08 M , V1 = ?

M2 = 0.25 M   , V2 = 5 L

V1 = M2V2/V1 = (0.25*5/2.08) = 0.6 L

take 0.6 L of 2.08 M HNO3 and add water upto 5 L.So that you will get 5.00L of a .250M HNO3 solution