Question

The concentration of a solution is:
I) The amount of solute present in a given amount of solution.
II) The amount of solute dissolved in a given mass or volume of solvent.
A. I
B. II
C. I,II
D. None of the above

Answer 1

Hint: Concentration refers to the amount of solute that is dissolved in the unit amount of the solution or the solvent. Concentration of a solution can be represented in many forms such as the amount of solute dissolved in a given mass or volume of solvent or the amount of solute present in a given amount (volume or mass) of solution.

Complete step by step solution:
From your chemistry lessons you have learned about the concentration of a solution and what it refers to. Concentration of a solution is defined as the quantity of the solute that is present in the particular quantity of solution or the solvent. There are many different methods to define the concentration of the solution such as Molarity, Molality, etc.
The most common unit among the concentration terms is molarity. It is very much important and useful for calculating the stoichiometry of the reaction in solution. It is defined as the number of moles of solute that is present in the 1 litre of the solution. And it is given as:
\[molarity(M)=\dfrac{moles\,of\,solute}{litres\,of\,solution}\]
The concentration can also be reported on the mass-to-mass (m/m) basis or on mass-to-volume (m/v) basis and they are mainly used in engineering application and in clinical laboratories.
Hence, we can say that concentration of a solution can be represented in many forms such as the amount of solute dissolved in a given mass or volume of solvent or the amount of solute present in a given amount (volume or mass) of solution. And it is expressed as:
\[Concentration\,of\,solution=\dfrac{Amount\,of\,solute}{Amount\,of\,solution}or\dfrac{Amount\,of\,solute}{Amount\,of\,solvent}\]
Therefore both (I) and (II) are correct.

Thus the correct option will be (C).

Note: The concentration of a solution is a type of macroscopic property. It can be expressed in many forms such as both quantitatively and qualitatively. It can be qualitatively expressed as the dilute solution or the concentration solution and quantitatively it can be expressed as saturated or unsaturated.