pH > 7 pH < 7 : Na2SO4, Na2S, NaCl, CuSO4? , .
.
- , . , , -, pH . , , .
, . , .
, , NaCl Na2SO4 , , pH 7.
Na2S NaOH H2S. - :
Na2S D 2Na+ + S2-,
S2- + HOH D HS- + OH-,
Na2S + H2O D NaHS + NaOH.
. , , Na+.
CuSO4 Cu(OH)2 H2SO4. - Cu2+:
CuSO4 D Cu2+ + SO .
:
Cu2+ + HOH D (CuOH)+ + H+.
:
2CuSO4 + 2H2O D (CuOH)2SO4 + H2SO4.