(), , , .
( ), , . +. . .
. , . , Na, Li, a, +, l Na+,+,NH4+, Li+, g+, l+ .
+ , + = 0,1 . HCl ( . *-1), . + ( ) () :
.
p-p
.
, , . , : , 100 , - , . : () (), . .
, , .
3. , .
2K + S = K2S
Na + Cl = NaCl
Cu + S = CuS
K + Cl = KCl
Li + S = Li2S
18