Question

How manny grams of concentrated nitric acid solution should be used to prepare 250ml of 2 M HNO3?The concentrated acid is 70%(w/w)HNO3

Answer 1

As we know,no of moles=M* VSo,req no of moles=(250/1000)*2=0.5And,req mass of HNO3=0.5*63=31.5Now 70g of HNO3 present in 100g of solSo 1g of HNO3 present in 100/70g of solHence,Req amount of HNO3 =(100/70)*31.5=45g