Question

How many grams of concentrated nitric acid solution should be used to prepare 500mL of 4,00M HNO3 ?The concentrated acid is 55% HNO3. density of concentrated nitric acid is 1.78 g cm-3

Answer 1

To prepare 250ml of 2M HNO3 , wt of conc sdlution required is as follows;

No of moles present in the above solution is 25o*2=500 mmoles=0.5 moles.0.5moles=0.5*63=31.5gms70%(W/V) means 70gms present in 100ml of conc solution.31.5gms of HNO3 contains in (100/70) *31.5 ml=45ml.