Which of the following is NOT true of colligative properties? Colligative properties are...
a) dependent on the molar mass of the solute.
b) dependent on the mass of solute present.
c) responsible for lowering the vapor pressure of a solution versus the vapor pressure of the pure solvent.
d) independent of the chemical identity of the solute.
e) all of these are true.
i'm not sure about my answer but i think it is e?
I would go with that.
E was wrong
To determine which of the statements is NOT true regarding colligative properties, let's break down each statement and analyze them:
a) Colligative properties are dependent on the molar mass of the solute.
This statement is true. Colligative properties, such as boiling point elevation and freezing point depression, are influenced by the number of solute particles (not the chemical identity) present in a solution. The more solute particles, the greater the effect on colligative properties.
b) Colligative properties are dependent on the mass of solute present.
This statement is false. Colligative properties are not affected by the mass of the solute but rather by the number of solute particles present in the solution. This is related to the mole concept and not the actual mass of the solute.
c) Colligative properties are responsible for lowering the vapor pressure of a solution versus the vapor pressure of the pure solvent.
This statement is true. Adding a non-volatile solute to a solvent lowers the vapor pressure of the solution compared to the pure solvent. This is known as vapor pressure lowering, one of the colligative properties.
d) Colligative properties are independent of the chemical identity of the solute.
This statement is true. Colligative properties depend on the number of solute particles (regardless of their chemical identity) rather than the specific chemical nature of the solute. As long as the solute particles do not dissociate or associate in the solution, the colligative properties will be similar.
e) All of these are true.
This statement is false. As discussed above, statement b is not true. Therefore, the correct answer is option b) dependent on the mass of solute present.
So, your answer is correct! The statement that is NOT true of colligative properties is b) dependent on the mass of solute present.