Ионы ОH⁻ образуются при диссоциации каждого из двух веществ:
1) Zn(OH)₂ и NaHCO₃
2) C₂H₅OH и NaOH
3) Mg(OH)Cl и H₂SO₄
4) NH₄OH и Ca(OH)₂
И поясните плиз)
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