Chapter 7 - solubility

Question 1

what is the definition of solubility ?

Answer 1

• mass of solute
• needed to saturate
• 100g of water
• at a particular temperature

Question 2

What are the units for solubility ?

Answer 2

grams per 100g of water

g/100g of water

Question 3

What is a saturated solution ?

Answer 3

A saturated solution is one which no more solute will dissolve at that temperature

Question 4

What is a solubility curve ?

Answer 4

A solubility curve is a graph of solubility in g/100g water (y axis) against temperature in *C (x axis)

Question 5

How does the solubility of a solid change as temperature increases ?

Answer 5

As the temperature increases the solubility increases

Question 6

How does the solubility of a gas change as temperature increases ?

Answer 6

As the temperature increases the solubility decreases

Question 7

How does emptying hot water in rivers affect the aquatic life ?

Answer 7

this causes the temperature of the river water to increase, and as a result the solubility of oxygen gas decreases. Fish then may not have enough oxygen to survive. This is known as thermal pollution.

Question 8

Why when a concentrated solution is of salt is cooled, will some of the solute be deposited ?

Answer 8

because the solubility of the solid decreases as the temperature decreases and some of the solid will crystallise out and be deposited