Question

One molar concentration of a solution represents:

• A. 1 mole of solute in 1 kg of solution.
• B. 1 mole of solute in 1 L of solution.
• C. 1 mole of solvent in 1 kg of solution.
• D. 1 mole of solvent in 1 L of solution.

Hint:

Molarity is volume-dependent, whereas molality is mass-dependent.

Answer 1

The Correct Option is B

Definition of Molarity
Molarity (M) is defined as: \[ M = \frac{{moles of solute}}{{liters of solution}} \] Thus, 1 M solution means 1 mole of solute is present in 1 L of solution. Thus, the correct answer is (B).

Answer 2

Step 1: Understanding molarity
Molarity (M) is a way to express the concentration of a solution.
It is defined as the number of moles of solute dissolved per liter of solution.

Step 2: Definition of 1 M solution
A 1 molar (1 M) solution means there is exactly 1 mole of solute present in every 1 liter of the total solution.
Note that the volume is the total volume of the solution, not just the solvent.

Step 3: Conclusion
Therefore, one molar concentration of a solution represents 1 mole of solute dissolved in 1 liter of solution.
This is a standard way to express concentration in chemistry for ease of calculations.