А)2НСI+K₂CO₃⇒2KCI+H₂O+CO₂
2Н⁺ + 2СI⁻+ 2K⁻ + CO₃²⁻ ⇒2K⁺ + 2CI⁻+H₂O+CO₂
2Н⁺ + CO₃²⁻ ⇒H₂O + CO₂
б) KOH+HNO₃⇒KNO₃+H₂O
K⁺+ OH⁻ + H⁺ + NO₃⁻⇒K⁺ + NO₃⁻+H₂O
Н⁺+ OH⁻ ⇒ H₂O
В)Cа(NO₃)₂+Na₂CO₃⇒CaCO₃+2NaNO₃
Cа²⁺ + 2NO₃⁻+ 2Na⁺ + CO₃²⁻⇒CaCO₃+2Na⁺ + 2NO₃⁻
Cа²⁺ + CO₃²⁻⇒CaCO₃.