Solubility

Question 1

What is a solvent?

Answer 1

A liquid that dissolves a solid

Question 2

What is a solute?

Answer 2

A solid that dissolves in a liquid

Question 3

What is a solution?

Answer 3

A mixture of a solid dissolved in a liquid

Question 4

What is solubility?

Answer 4

Solubility is a measure of the mass of a solute that saturates of 100g of solvent at a given temperature, units are g/100g solvent.

Question 5

What is a saturated solution?

Answer 5

A solution which contains as much of a dissolved solute that will dissolve in 100g of solvent at a given temperature, units are g/ 100g solvent

Question 6

What factors affect solubility?

Answer 6

Heat
Stirring
Volume of solvent
Amount of solute

Question 7

How does temperature affect the solubility of gasses

Answer 7

Gases become less soluble at higher temperatures

Question 8

What equation allows one to determine the solubility of a solid

Answer 8

Solubility (g/100g of water) = mass of solute x 100
———————
mass of solvent

Question 9

What is a solubility curve?

Answer 9

A solubility curve is a graph of solubility against temperature

Question 10

How should you label the axis of a solubility curve?

Answer 10

Y axis: Solubility (g/100g solvent)

X axis Temperature (*C)

Question 11

What should you be able to do with a solubility curve?

Answer 11

Read off the maximum mass that dissolves at a given temperature

Find what temperature a certain amount of solute dissolves at.

Calculate the mass that would crystallise out if saturated solution cooled between two temps.