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

Tardigrade Admin · Accepted Answer

Molarity =( W × 1000/ text Mol. wt . × V text sol ( mL )) ⇒ 2=( W /63) × (1000/250) W=(63/2) g Mass of acid × (70/100)=(63/2) Mass of acid =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 $70% H N O_{3}$ :

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

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

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

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

Molarity $= \frac{W \times 1000}{Mol. wt . \times V _{sol (m L)}} \Rightarrow 2 = \frac{W}{63} \times \frac{1000}{250}$
$W = \frac{63}{2} g$
Mass of acid $\times \frac{70}{100} = \frac{63}{2}$
Mass of acid $= 45 g$

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

45.0 g conc. HNO3​

90.0 g conc. HNO3​

70.0 g conc. HNO3​

54.0 g conc. HNO3​