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Some Basic Concepts of Chemistry question

2013 · Q86
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Some Basic Concepts of Chemistry question

2013 · Q86

NEETChemistrySome Basic Concepts of ChemistryMCQ+4 / −1
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.
  1. A
    70.0 g conc. HNO3
  2. B
    54.0 g conc. HNO3
  3. C
    45.0 g conc. HNO3
  4. D
    90.0 g conc. HNO3
View written solutionFree

Correct answer: C

2=m63×0.252 = {m \over {63 \times 0.25}}2=63×0.25m​

⇒\Rightarrow⇒ m = 2 × 63 × 0.25 = 31.5 g

Now, if concentrated HNO3 is 100% then it requires 31.5 g. But the original solution of HNO3 is 70% concentrated.

Hence, the mass of HNO3 required to produce 2.0 M solution

= 10075×31.5{{100} \over {75}} \times 31.575100​×31.5

= 45 g of HNO3

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