1) NiCl₂ + 2LiOH → Ni(OH)₂ ↓ + 2LiCl;
Ni²⁺ + 2Cl⁻ + 2Li⁺ + 2OH⁻ → Ni(OH)₂ ↓ + 2Li⁺ + 2Cl⁻;
Ni²⁺ + 2OH⁻ → Ni(OH)₂ ↓.
2) CaCO₃ + 2HNO₃ → Ca(NO₃)₂ + CO₂ ↑ + H₂O;
CaCO₃ + 2H⁺ + 2NO₃⁻ → Ca²⁺ + 2NO₃⁻ + CO₂ ↑ + H₂O;
CaCO₃ + 2H⁺ → Ca²⁺ + CO₂ ↑ + H₂O.
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1) NiCl₂ + 2LiOH → Ni(OH)₂ ↓ + 2LiCl;
Ni²⁺ + 2Cl⁻ + 2Li⁺ + 2OH⁻ → Ni(OH)₂ ↓ + 2Li⁺ + 2Cl⁻;
Ni²⁺ + 2OH⁻ → Ni(OH)₂ ↓.
2) CaCO₃ + 2HNO₃ → Ca(NO₃)₂ + CO₂ ↑ + H₂O;
CaCO₃ + 2H⁺ + 2NO₃⁻ → Ca²⁺ + 2NO₃⁻ + CO₂ ↑ + H₂O;
CaCO₃ + 2H⁺ → Ca²⁺ + CO₂ ↑ + H₂O.