FC12: Group 2 Flashcards
1
Q
Why does Ba ‘react more quickly?
A
Large atomic radius
Lower ionisation energy- more reactive
2
Q
What is the metal hydroxide pattern down group 2?
A
They become more soluble so the solutions become more alkaline
3
Q
How is Mg(OH)2 only sparingly soluble?
A
It looks insoluble but if we test the pH of the water it is 10.3 so there must be hydroxide ions there
4
Q
Why is the solubility higher down group 2?
A
As the metal ion gets larger down the group, it is less strongly attracted to the small hydroxide ion. As a general rule, the bigger the mismatch between the positive and negative ions, the more soluble it is.
5
Q
Why do we ignore the rule of metals of a group tending to react with water to produce hydroxides for Be down to Ba?
A
Be- doesn't react. Mg- reacts very slowly Ca- reacts quickly Sr- reacts more quickly Ba- reacts more quickly
