Concentration of Solution Percentage by Mass

Concept Explanation

Concentration of Solution Percentage by Mass

The concentration or strength of a solution depends on how much solute is dissolved in it. The amount of solute dissolved in a unit quantity (volume or mass) of a solution is known as the concentration or strength of the solution. There are various methods to express the concentration of a solution. One of the method is to express the concentration of Solution as Percentage:

Percentage: The concentration of a solution may be expressed in terms of percentage, by mass or by volume.

Percentage by mass :-

It is defined as the number of parts by mass of the solute dissolved per hundred parts by mass of the solution. For example, a 10% by mass of a solution of urea in water will have 10 g of urea dissolved in 90 g of water. The concentration of the solution is then expressed as

$frac{10g}{10g+90g}=frac{10}{100};X100=10%;urea;by;mass$

Similarly, the concentration of a solution containing 5 g of NaCl in 95 g of water can be expressed as

$frac{5g}{5g+95g}=frac{5}{100};X100=5%;NaCl;by;mass$

$Thus,; percentage ;by; mass= frac{mass;of;solute}{mass; of;solution}times 100$

Example :-

A syrup is prepared by dissolving 250 g sucrose in 150 g of water. Calculate the mass percent of sucrose in the solution.

Solution :-

We know that

$Percentage ;by; mass= frac{mass;of;solute}{mass; of;solution}times 100$

However, Mass of solution = Mass of solute + Mass of solvent = 250 + 150 = 400 gm

$Mass: %:=:frac{250g:X:100}{400:g}:=:62.5%$

Volume Percentage :-

It may be defined as the volume of solute in ml present in 100 ml of the solution.

$Percentage: by: Volume = frac{Volume: of: the:solute}{Volume: of: the: solution}: X :100$

For example, a 20% solution of acetic acid (by volume) means 20 ml of acetic acid is present in 100 ml of solution.

Sample Questions

(More Questions for each concept available in Login)

Question : 1

Which of the following are correct : (a) The concentration or strength of a solution depends on how much solute is dissolved in it. (b) The amount of solute dissolved in a unit quantity of a solution is known as the concentration or strength of the solution. (c) The concentration of a solution may be expressed in terms of percentage, by mass or by volume.
A. Only (a) and (b) are correct.		B. Only (b) and (c) are correct.
C. Only (a) and (c) are correct.		D. All of these.
Right Option : D
View Explanation

Question : 2

A syrup is prepared by dissolving 250 g sucrose in 150 g of water. Calculate the mass percent of sucrose in the solution.
A. 30%	B. 40%	C. 62.5%	D. 60%
Right Option : C
View Explanation

Question : 3

The concentration of a solution may be expressed in terms of percentage, ____________________.
A. By mass	B. By volume	C. Both (a) and (b) are correct.	D. None of these.
Right Option : C
View Explanation

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