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.
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 | |||
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 solution is prepared by dissolving 110 gm of salt in water. If the concentration of the solution is 20 per cent, then the mass of solution will be | |||
| Right Option : B | |||
| View Explanation | |||
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