Properties of Group 2 Compounds:

Question 1

What happens to the solubility of group 2 sulfates?

Answer 1

= decreases in solubility moving down the group
= mgso4 is highly soluable
= Baso4 is highly insoluable

Question 2

How does the insolubility of BaSo4 make it useful? 1

Answer 2

= suspension of BaSo4 can be given to patients before they have an x-ray- barium meal- strongly absorbs x-rays
= insoluable: does not enter the patients blood stream
=

Question 3

How does the insolubility of BaSo4 make it useful? 2

Answer 3

= use a solution of barium chloride to test for sulfate ions
= Bacl is soluable in water- Ba2+ (aq) and 2cl2- (aq)
= if we mix a solution of barium chloride with solution containing sulfate ions, it will for baSo4 which is insoluable(white precipitate)
=

Question 4

What one point is there of this test ?

Answer 4

= need to add either HCL or HNo3 to the barium chloride solution before we test for sulfate- reacts to form co2 and water
= if co32- ions are present they will react with barium ions
= barium chloride is insoluable forms white precipitate

Question 5

What happens to the solubility of group 2 elements with hydroxides?

Answer 5

= increases in solubility

Question 6

When magnesium burns with oxygen what happens?

Answer 6

= burns with a bright white flame
= magnesium oxide is a white solid with a high mp and bp

Question 7

Why is magnesium hydroxide safe to use?

Answer 7

= weakly alkaline

Question 8

What are the properties of calcium hydroxide?

Answer 8

= partially soluable
= appears as a white precipitate
=