Boiling Point Elevation Concepts

The video tutorial explains boiling point elevation, a process where adding a non-volatile solute to a solution raises its boiling point. It contrasts this with freezing point depression. Practical examples, such as adding salt to water, are provided to illustrate the concept. The tutorial details the mechanism behind boiling point elevation and provides a formula for calculating it. Several example calculations are demonstrated, including solutions with salt, benzene, and sugar, to show how to determine the new boiling point after adding a solute.

What happens to the boiling point of a solution when a non-volatile solute is added?

• It increases.

• It remains the same.

• It decreases.

• It fluctuates.

Which of the following is an example of a non-volatile solute?

• Acetone

• Methanol

• Ethanol

• Sodium chloride

What is the formula used to calculate the change in boiling point?

• ΔT = kf × molarity

• ΔT = kb × molality

• ΔT = kb × molarity

• ΔT = kf × molality

If the boiling point of water is increased by 4.5°C due to salt, what is the new boiling point?

• 100°C

• 110°C

• 104.5°C

• 95.5°C

What is the boiling point elevation constant (kb) for benzene?

• 3.67°C kg/mol

• 1.86°C kg/mol

• 2.53°C kg/mol

• 0.512°C kg/mol

How much does the boiling point of benzene increase when a non-volatile solute with a molality of 1.2 is added?

• 4.5°C

• 2.53°C

• 3.036°C

• 1.2°C

What is the new boiling point of benzene after adding a non-volatile solute with a molality of 1.2?

• 80°C

• 83°C

• 86°C

• 89°C

What is the boiling point elevation constant (kb) for water?

• 0.512°C kg/mol

• 3.67°C kg/mol

• 1.86°C kg/mol

• 2.53°C kg/mol

How much does the boiling point of water increase when sugar is added with a molality of 2.20?

• 2.20°C

• 3.67°C

• 1.12°C

• 0.512°C

What is the new boiling point of water after adding sugar with a molality of 2.20?

• 102°C

• 103°C

• 100°C

• 101°C