Concentration of Solution Percentage by Mass
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
Similarly, the concentration of a solution containing 5 g of NaCl in 95 g of water can be expressed as
Example :-
We know that
However, Mass of solution = Mass of solute + Mass of solvent = 250 + 150 = 400 gm
Volume Percentage :-
It may be defined as the volume of solute in ml present in 100 ml of the solution.
For example, a 20% solution of acetic acid (by volume) means 20 ml of acetic acid is present in 100 ml of solution.
Calculate the mass of urea, if the percentage by mass of the solution is 45% and volume of solution is 400g ? | |||
| Right Option : B | |||
| View Explanation | |||
A syrup is prepared by dissolving 250 g sucrose in 150 g of water. Calculate the mass percent of sucrose in the solution. | |||
| Right Option : C | |||
| View Explanation | |||
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. | |||
| Right Option : D | |||
| View Explanation | |||
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