. How many grams of concentrated nitric acid solution


should be used to prepare 250 mL of 2.0 M HNO3? The concentrated acid is 70% HNO3

A: 45.0 g conc. HNO3

B: 90.0 g conc. HNO3

C: 70.0 g conc. HNO3

D: 54.0 g conc. HNO3

 

Best Answer

Explanation-

1. No. of moles = Molarity Χ Volume 

n=  2.0 M Χ 250mL/1000

n= 0.5

Mass of nitric acid= molar mass Χ no.of moles / Percentage composition       

Molar mass of HNO3 = 1+ 14+ 16Χ 3= 63

Mass of nitric acid=  63 Χ  0.5Χ 100=  45 gm / 70

Final Answer-

So, The correct option is A. 

How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO3?

The concentrated acid is 70% HNO3= 45.0 g conc. HNO3

 

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