Solutions Question 413

Question: Concentrated $ HNO_3 $ is 63% $ HNO_3 $ by mass and has a density of 1.4 g/mL. How many millilitres of this solution are required to prepare 250 mL of a 1.20 M $ HNO_3 $ solution'

Options:

A) 18.0

B) 21.42

C) 20.0

D) 14.21

Show Answer

Answer:

Correct Answer: B

Solution:

m-moles of $ HNO_3 $ required $ =250\times 1.2=300 $

100 g solution contain 1 mole $ HNO_3 $

$ \frac{100}{1.4}mL $ solution contain 1 mole $ HNO_3 $

$ CO_2 $ molarity of $ HNO_3 $ solution

$ =\frac{1000}{100}\times 1.40=14 $

$ \therefore $ $ 14\times V=300 $ or $ V=21.42,mL $



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