Water Solutes

Question 0

Name one problem with hard water?

Answer 0

Hard wAter does not easily form a lather

Calcium and magnesium ions react with soap forming a precipitate called scum

Question 1

What ions does hard water contain?

Answer 1

Calcium or magnesium ions

Question 2

What causes hard water

Answer 2

Calcium or magnesium ions dissolved in water forming hard water from limestone and chalk

Question 3

What is temporary hardness caused by

Answer 3

Dissolved calcium hydrocarbonate

Question 4

How can temporary hardness be removed

Answer 4

By boiling the water

Question 5

How is temporary hardness removed by boiling water

Answer 5

Calcium hydrocarbonate breaks down when heated

Question 6

Why can’t calcium irons react with soap To form at scum

Answer 6

Calcium carbonate formed is not soluble

Question 7

What causes permanent Hardness

Answer 7

Substances such as calcium sulphate

Question 8

Why is permanent hard water different from temporary

Answer 8

Permanent hardness cannot be removed by boiling

Question 9

Name the substance that causes temporary hardness in water

Answer 9

Calcium hydrocarbonate

Question 10

Name of substance that causes permanent hardness in water

Answer 10

Calcium sulphate

Question 11

Explain why both types of hardness can be removed using an ion exchange resin

Answer 11

calcium ions are swapped for sodium ions from the resin. sodium ions do not form scum with soap