L1 /
13
CH1012
TRENDS IN ACIDITY
• Boron
hydroxide B(OH)3 is acidic.
• Al & Ga hydroxides are amphoteric
• thallium hydroxide TlOH is basic.
This reflects the change from metalloid
to
metal as we go down the Group.
acidic ® amphoteric ® basic
metal as we go down the Group.
acidic ® amphoteric ® basic
• In a similar way for Group IIA:
beryllium hydroxide is amphoteric.
beryllium hydroxide is amphoteric.
• All the other
Group IA and Group IIA hydroxides
are basic. This accompanies
a change from “less” metal ® metal.
a change from “less” metal ® metal.
In(OH)3 is insoluble