Group 2

Question 1

What is the most insoluble sulfate?

Answer 1

BaSO4

Question 2

What and why is BaSO4 used in medicine?

Answer 2

Used for Barium meals because it is insoluble so cant poison humans

Question 3

What colour is BaSO4?

Answer 3

White ppt

Question 4

What is the trend in ionisation energies of group 2?

Answer 4

Decreases down Group 2

Question 5

How is SO2 removed from waste gases?

Answer 5

By an acid-base reaction with CaO

Question 6

Describe the reaction of Magnesium with steam

Answer 6

Forms MgO and H2
White solid/ash produced
Bright white light

Question 7

What is the trend in atomic radius in group 2?

Answer 7

Increases as you go down group 2

Question 8

What is the trend in group 2 atoms reacting with water?

Answer 8

Group 2 elements react more vigourously with water as you go down the group

Question 9

Which group 2 hydroxide is most soluble in water?

Answer 9

Ba(OH)2

Question 10

How do you determine solubility of a solution?

Answer 10

1. Take a known volume of the standard solution
2. Evaporate the filtrate to dryness
3. Weigh the residue

Question 11

What is Mg(OH)2 used for?

Answer 11

Used as an antacid to neutrilise excess stomach acid
Cannot be used for titrations of weak acids because it is insoluble
Also used in agriculture

Question 12

Why should you wash hydroxides with deionised water?

Answer 12

To remove solid impurities

Question 13

What is the reaction to obtain titanium?

Answer 13

TiCl4 + 2Mg –> 2MgCl2 +Ti

Question 14

How do you isolate CuSO4 from BaSO4?

Answer 14

Add water
Filter
Crystalise filtrate
Dry the crystals