
How many grams of concentrated nitric acid solution should be used to prepare 250mL of 2 M ? The concentrated acid is 70 % (w/w) .
A. 90.0g conc.
B. 70.0g conc.
C. 54.0g conc.
D. 45.0g conc.
Answer
428.1k+ views
Hint: Molarity is the number of moles of solute per liter of solution. That means if we can calculate the amount of solute in 1000mL of solution, we can begin to proceed towards our answer.
Complete step by step solution:
We know,
2M means 2 moles of in 1000mL of solution.
Therefore, in 250mL solution we have
Molecular weight of = (1x1) + (1x14) + (3x16) = 63 grams.
We now calculate the weight of in 250 mL of solution.
We know,
Substituting the values in this equation we get,
Weight of = 0.5 x 63g
70% weight by weight means 70g
is present in 100g of solution.
Therefore, according to our calculation,
The mass of required is
Hence, Option (D) 45.0g of conc. is the correct answer.
Note: Instead of calculating the moles of solute and liters of solution present individually, we can also string all the calculations together in one problem.
To calculate the molarity of a solution, it is essential to remember the number of moles of solute must be divided by the total liters of solution produced. If the amount of solute is given in grams, we must first calculate the number of moles of solute using the solute’s molar mass, then calculate the molarity using the number of moles and total volume.
Complete step by step solution:
We know,
2M
Therefore, in 250mL solution we have
Molecular weight of
We now calculate the weight of
We know,
Substituting the values in this equation we get,
Weight of
70% weight by weight means 70g
is present in 100g of solution.
Therefore, according to our calculation,
The mass of
Hence, Option (D) 45.0g of conc.
Note: Instead of calculating the moles of solute and liters of solution present individually, we can also string all the calculations together in one problem.
To calculate the molarity of a solution, it is essential to remember the number of moles of solute must be divided by the total liters of solution produced. If the amount of solute is given in grams, we must first calculate the number of moles of solute using the solute’s molar mass, then calculate the molarity using the number of moles and total volume.
Recently Updated Pages
How to find Oxidation Number - Important Concepts for JEE

How Electromagnetic Waves are Formed - Important Concepts for JEE

Electrical Resistance - Important Concepts and Tips for JEE

Average Atomic Mass - Important Concepts and Tips for JEE

Chemical Equation - Important Concepts and Tips for JEE

Concept of CP and CV of Gas - Important Concepts and Tips for JEE

Trending doubts
JEE Main 2025 Session 2: Application Form (Out), Exam Dates (Released), Eligibility, & More

JEE Main 2025: Derivation of Equation of Trajectory in Physics

Learn About Angle Of Deviation In Prism: JEE Main Physics 2025

Number of sigma and pi bonds in C2 molecule isare A class 11 chemistry JEE_Main

Electric Field Due to Uniformly Charged Ring for JEE Main 2025 - Formula and Derivation

JEE Main 2025: Conversion of Galvanometer Into Ammeter And Voltmeter in Physics

Other Pages
NCERT Solutions for Class 11 Chemistry Chapter 9 Hydrocarbons

NCERT Solutions for Class 11 Chemistry Chapter 7 Redox Reaction

JEE Advanced Marks vs Ranks 2025: Understanding Category-wise Qualifying Marks and Previous Year Cut-offs

NCERT Solutions for Class 11 Chemistry Chapter 5 Thermodynamics

Hydrocarbons Class 11 Notes: CBSE Chemistry Chapter 9

NCERT Solutions for Class 11 Chemistry In Hindi Chapter 1 Some Basic Concepts of Chemistry
