Concentration of Solutions

Q.

What is the correct formula for solubility of a solute in a solvent at any given temperature t⁰C?

1. $\frac{\text{Weight of solute(Kg)}\ast 100}{\text{Weight of solution}\left(Kg\right)}$
2. $\frac{\text{Weight of solvent}\left(g\right)\ast 100}{\text{Weight of solute(g)}}$
3. $\frac{\text{Weight of solute(g)}}{\text{Weight of solvent(g)}\ast 100}$
4. $\frac{\text{Weight of solute(g)}\ast 100}{\text{Weight of solvent(g)}}$

Q. (a) What do you mean by the concentration of a solution? Discuss any three methods of expressing the concentration of a solution.
(b) A solution contains 30 g of sugar dissolved in 300 g of water. Calculate the concentration of this solution.

Q. 30g of salt is dissolved in 100 g of water. Calculate the concentration of the solution formed in mass-by-mass percentage?

1. 33.07 %
2. 30 %
3. 26.47 %
4. 23.07 %

Q.

A solution is prepared with 10 grams of solute in 100 grams of water. The mass percentage of the solution is ___%.

Q. 80 ml of a solution contains 20 g of solute. What is the concentration of this solution in terms of mass by volume percentage of the solution?

1. 25

Q.

Calculate the mass of water required to make 200gm of 25% solution of glucose.

Q.

What happens to a saturated sugar solution when the temperature is increased?

Q. Solubility is the maximum amount of a substance that will dissolve in a given amount of solvent at a specified temperature.

1. True
2. False

Q. (a) What do you mean by the concentration of a solution? Discuss any three methods of expressing the concentration of a solution.
(b) A solution contains 30 g of sugar dissolved in 300 g of water. Calculate the concentration of this solution.

Q. How can we say that milk is pure?
What is meant by solute and give one example.

Q. The property by virtue of which sugar gets dissolved in water is called .

1. purity
2. fluidity
3. solubility

Q. Solubility is the maximium amount of a substance that will dissolve in a given amount of solvent at a specified temperature.

1. True
2. False

Q. Solubility of a substance is its maximum amount that can be dissolved in a specified amount of solvent. It depends upon: (i) nature of solute (ii) nature of solvent (iii) temperature (iv) pressure Ans is given as all of the above. But effect of (iv) pressure on solubility is negligible right?

Q. Calculate the mass of sodium sulphate required to prepare a 20% (m/m%) solution in 100 g of water?

[2 Marks]
[Exemplar Question]
[Concentration of Solution]

Q.

On what solubility depends? Solute or solvent.

Q.

Question 20
Does the solubility of a substance change with temperature? Explain with the help of an example.

Q. Solubility is the maximium amount of a substance that will dissolve in a given amount of solvent at a specified temperature.

1. True
2. False

Q. The property by virtue of which sugar gets dissolved in water is called .

1. purity
2. fluidity
3. solubility

Q. Choose the correct statement regarding given percentage concentration terms.

1. $\%w/w$ is defined as the weight in grams of the solute per $100\text{g}$ of the solution
2. $\%w/w$ is defined as the weight in grams of the solute per $100\text{g}$ of the solvent
3. $\%w/V$ is defined as the weight in grams of the solute per $1000\text{mL}$ of the solution
4. $\%w/V$ is defined as the weight in grams of the solute per $100\text{mL}$ of the solvent

Q. 30g of salt is dissolved in 100 g of water. Calculate the concentration of the solution formed in mass-by-mass percentage?

1. 33.07 %
2. 30 %
3. 26.47 %
4. 23.07 %

Q. A solution is prepared by dissolving 10 g of salt in 100 g of water. Calculate the mass percentage of the solution.

1. 9.09

Q. A solution is said to be if no more solute can be dissolved in it.

1. saturated
2. unsaturated
3. diluted

Q. The amount of solute present in a given amount of solution represents:

1. dispersion
2. concentration
3. saturation
4. absorption

Q. A solution contains 50 g of common salt in 350 g of water. Calculate the concentration in terms of mass by mass percentage of the solution.

1. 12.11%
2. 12%
3. 12.5%
4. 11%

Q. A solution is prepared by dissolving 10 grams of solute in 100 grams of water. Calculate the mass percentage of the solution.

1. 9.09%
2. 10%
3. 9.90%
4. 10.09%

Q. 80 mL of solution contains 20 g of solute. Calculate the concentration in terms of mass by volume percentage of the solution.

1. 45%
2. 55%
3. 25%
4. 35%

Q. 80 ml of a solution contains 20 g of solute. What is the concentration of this solution in terms of mass by volume percentage of the solution?

1. 25

Q. Which of the following represents the mass of glucose and mass of water required to make 250g solution which contains 25% glucose.

1. Mass of glucose = 62.5 g
2. Mass of water = 375 g
3. Mass of glucose = 75 g
4. Mass of water = 187.5 g