When magnesium hydrogen carbonate (Mg(HCO3)2) reacts with ethanoic acid (CH3COOH), the products of the reaction are magnesium acetate, carbon dioxide, and water. The balanced chemical equation for this reaction is:

2CH3COOH + Mg(HCO3)2 → Mg(CH3COO)2 + 2CO2 + 2H2O

In this reaction, ethanoic acid donates a proton (H+) to magnesium hydrogen carbonate, forming magnesium acetate and carbonic acid (H2CO3). Carbonic acid is unstable and decomposes into carbon dioxide (CO2) and water (H2O).