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How many grams of conc. nitric acid solution should be used to prepare 250ml of 2.0 M HNO 3 ? (1) 54.0 conc. HNO 3 (2) 45.0 conc. HNO 3 (3) 90.0 conc. HNO 3 (4) 70.0 conc. HNO 3

How many grams of conc. nitric acid solution should be used to prepare 250ml of 2.0 M HNO3?
  1.   (1)   54.0 conc. HNO3
  2.   (2)   45.0 conc. HNO3
  3.   (3)   90.0 conc. HNO3
  4.   (4)   70.0 conc. HNO3 

Grade:12th pass

1 Answers

Arun
25750 Points
6 years ago
Dear Devesh

You have not provided the concentration of HNO3.
Please check and repost it. But I am solving it for 70% concentrated HNO3.
The required number of moles=( 250/1000)×2
=0.5 moles
(no. of moles=molarity × volume)
so,required mass of HNO3=0.5×63
=31.5 grams
(given mass=no. of moles × molar mass)
Given, 
70 grams of HNO3 are present in 100 grams of the solution
so,1 gram will be present in 100/70 grams of solution
hence 31.5 grams will be present in (100/70)×31.5 grams of solution.
so amount of concentrated nitric acid solution used is 45 grams.
 
Regards
Arun (askIITians forum expert)

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