Добрый день.
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Cu → CuO → CuCl₂ → Cu(OH)₂ → Cu(NO₃)₂
1. 2Cu + O₂ = 2CuO
2. CuO + 2HCl = CuCl₂ + H₂O
CuO + 2H⁺ + 2Cl⁻ = Cu²⁺ + 2Cl⁻ + H₂O
CuO + 2H⁺ += Cu²⁺ + H₂O
3. CuCl₂ + 2KOH = Cu(OH)₂↓+ 2KCl
Сu²⁺ + 2Cl⁻ + 2K⁺ + 2OH⁻ = Cu(OH)₂↓ + 2K⁺ + 2Cl⁻
Сu²⁺ + 2OH⁻ = Cu(OH)₂↓
4. Cu(OH)₂ + 2KNO₃ = 2KOH + Cu(NO₃)₂
Cu(OH)₂ + 2K⁺ + 2NO₃⁻ = 2K⁺ + 2OH⁻ + Cu²⁺ + 2NO₃⁻
Cu(OH)₂ = 2OH⁻ + Cu²⁺