Write equations for the reaction of an acid with ; a) a metal (b) a metal carbonate (c) a metal hydrogencarbonate (d) a base (e) a metallic oxide .

1) Reaction of acetic acid with sodium metal :
CH₃COOH + Na $\to$CH₃COONa + 1/2H₂
2) 2CH₃COOH + Na₂CO₃ $\to$ 2CH₃COONa  + CO₂ + 2H₂O
3) CH₃COOH + NaHCO₃ $\to$ CH₃COONa + H₂O + CO₂
4) CH₃COOH + NaOH $\to$ CH₃COONa + H₂O