1.

How many grams of concentrated nitric acid solution should be used to prepare 250 mL of "2.0 M HNO"_(3) ? The concentrated nitric acid is 70%HNO_(3)

Answer»

`"45.0 G conc HNO"_(3)`
`"90.0 g conc HNO"_(3)`
`"70.0 g conc HNO"_(3)`
`"54.0 g conc HNO"_(3)`

SOLUTION :250 ML of 2.0 M `HNO_(3)` will contain `HNO_(3)`
`=(2)/(1000)xx250=?0.5 MOL "=0.5xx63 g = 31.5g`
As concentrated `HNO_(3)` is `70%` , therefore, concentrated `HNO_(3)` required `=(100)/(70)xx31.5g=45g`


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