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This question belongs to physical chem- SOLUTIONS. How many grams of conc. nitric acid solution should be used to prepare 250ml of 2.0 M HNO3? 54.0 conc. HNO3 45.0 conc. HNO3 90.0 conc. HNO3 70.0 conc. HNO3

This question belongs to physical chem- SOLUTIONS.
How many grams of conc. nitric acid solution should be used to prepare 250ml of 2.0 M HNO3?
  1. 54.0 conc. HNO3
  2. 45.0 conc. HNO3
  3. 90.0 conc. HNO3
  4. 70.0 conc. HNO3

Grade:12th pass

1 Answers

Arun
25763 Points
3 years ago
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.

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