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

Question

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 (A) 90.0 g conc. HNO 3 (B) 70.0 g conc. HNO 3 (C) 54.0 g conc. HNO 3 (D) 45.0 g conc. HNO 3

Tardigrade Admin · Accepted Answer

Molarity ( M )=( text wt × 1000/ text mol. wt. × text vol ( mL )) 2=(w t ./63) × (1000/250) wt .=(63/2) g =31.5 g wt. of 70 % acid =(100/70) × 31.5=45 g

Q. How many grams of concentrated nitric acid solution should be used to prepare $250 m L$ of $2.0 M H N O_{3}$ ? The concentrated acid is $70% H N O_{3}$

$90.0$ g conc. $H N O_{3}$

$70.0$ g conc. $H N O_{3}$

$54.0$ g conc. $H N O_{3}$

$45.0$ g conc. $H N O_{3}$

Molarity $(M) = \frac{wt \times 1000}{mol. wt. \times vol ( m L )}$
$2 = \frac{wt .}{63} \times \frac{1000}{250}$
$wt . = \frac{63}{2} g = 31.5 g$
wt. of $70%$ acid $= \frac{100}{70} \times 31.5 = 45 g$

Q. How many grams of concentrated nitric acid solution should be used to prepare 250mL of 2.0MHNO3​ ? The concentrated acid is 70%HNO3​

90.0 g conc. HNO3​

70.0 g conc. HNO3​

54.0 g conc. HNO3​

45.0 g conc. HNO3​