For any acidic or basic salts, ​complete the chemical equations​ that show how those substances react with water.

Question

HCO​3-​ +H​O⇋

And

H8C4​H​4O​-​ + H​O⇋

Answer 1

HCO​3-​ + OH- + H⁺ ⇋ H₂CO₃ <-> H₂O + CO₂ + OH-

H8C4​H​4O​-​ + OH- + H⁺ ⇋ H8C4​H​4OH + OH-

Answer 2

If the compound is a base it will take a hydrogen from water. If it is an acid it will donate a hydrogen to water. Since you have OH^- in the reactant side, this tells you that you should have water in the products side (O^2- is not likely). Therefore, you have:

HCO₃^- + OH^- ⇋ CO₃^2- + H₂O

H₈C₄​H​₄O​^-​ + H​O^-⇋ H₈C₄​H​₄O​H + H₂O