Question

how many grams of concentrate d nitric acid solution should be used to prepare 250 ml of 2 M HNO3 ? the concentrate acid is 70% (w/w) HNO3​

Answer 1

2= (w×1000)/(63×250)

where 63 is the molar mass of HNO3

Given that, concentrate acid is 70%

2= (w×1000×70)/(63×250×100)

w=45 g