1.

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

Answer»

90.0 g conc. `HNO_(3)`
70.0 g conc. `HNO_(3)`
54.0 g conc. `NHO_(3)`
45.0 g conc. `HNO_(3)`

SOLUTION :MOLARITY `=("MOLES of" HNO_(3))/("Vol. of solution")xx1000`
`2=("mass"//63)/(100)xx63=31.5`
Mass of `HNO_(3)` required for 70% solution
`=(31.5xx100)/(70)=45.0g`


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