L1 /
7
CH1012
GROUP 1A + H2O
Reactivity of groups IA and
IIA
(a) Reaction
with water
Group 1A +
H2O
M = Li,Na,K,Rb,Cs
ØLi reacts slowly with H2O at 25oC
ØNa reacts vigorously, K with a flame
2M
+ 2H2O ® 2MOH + H2
Ø Rb and Cs EXPLOSIVELY
M.
• This reactivity pattern reflects
the increasing tendency down
the Group to form the cation M+
and the high mp. of Li.
the increasing tendency down
the Group to form the cation M+
and the high mp. of Li.