How many grams of concentrated nitric acid solution should be used to prepare 250mL of 2.0M HNO3? The concentrated acid is 70% HNO3.

  • Option 1)

    54.0 g conc. HNO3

  • Option 2)

    45.0 g conc. HNO3

  • Option 3)

    90.0 g conc. HNO3

  • Option 4)

    70.0 g conc. HNO3

 

Answers (1)

Moles of HNO_3 needed= \frac{1}{4}\times 2m=\frac{1}{2} mol

Weigth of HNO_3 needed= 63\times \frac{1}{2}= 31.5g

The given acid is 70 % HNO_3

\therefore wt. required =\frac{31.5}{0.7} = 45g


Option 1)

54.0 g conc. HNO3

Incorrect

Option 2)

45.0 g conc. HNO3

Correct

Option 3)

90.0 g conc. HNO3

Incorrect

Option 4)

70.0 g conc. HNO3

Incorrect

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