Question

I. Does the solubility of the solute increase or decrease in each of the following situations?

1. Ice is placed in a glass of cola (solute is CO2 gas).

2. Honey is dissolved in hot water instead of cold water.

3. The pressure of O2 over a solution is increased (solute is O2 gas).

II. Which of the following statements about the dilution of a solution are true?

	The volume of solution remains unchanged.
	The amount of solute decreases.
	The amount of solute remains the same.
	The volume of the solution is decreased.

III. In order to prevent the process of either crenation or hemolysis with red blood cells an intervenous solution concentration should be ________ to the concentration of blood.

	hypotonic
	isotonic
	hypertonic
	all of these

Answer 1

Answer I):-

1):-

Solubility of gas in the liquid increases with decrease in temperature. Thus, when ice is placed in a glass of cola , solubility of CO₂ increases.

2):-

Solubility of solids in liquid solvent increases with increase in temperature. Honey dissolves quickly in hot water than the cold water.

3):-

According to the Henry's law, the solubility of gas in liquid increases with increase in the partial pressure of gas over the liquid.Thus, when the pressure of O₂ gas is increased over the solution, the solubility of O₂ increases.

-----------------------------------------------------

Answer II):-

Option c): "The amount of solute remains same" is correct.

Dilution means addition of more solvent into the solution and thus, on dilution the concentration of solution decreases.

------------------------------------------------------

Answer III):-

"Isotonic" is correct one.

When red blood cells in hypertonic solution, it becomes crenated. Because when the red blood cells are placed in hypersonic solution, they lose water due to exo-osmosis. While, if the red blood cells are placed in hypotonic solution, the cells swells up by absorbing water and ultimately bursts (hemolysis). This is because of endo-osmosis.

-------------------------------------------------------

​​​​​​