Fill in the blank by choosing the appropriate word/words from those given in the brackets.
(acetaldehyde, formaldehyde, benzaldehyde, yellow, white, violet, Cannizzaro's, Liebermann, no `alpha`-hydrogen atom, `1alpha`-hydrogen atom, `2alpha`-hydrogen atoms, aldol, `beta`-hydroxy aldehyde, aldol condensation, mixed condensation, + I,-I, -M,+ M. decreases, increases, benzalchloride, PCI, SOCh. sec, alcohol, tert, alcohol, phenylhydrozone, semicarbazone, more, less, acetals, ketals, silver mirror, test, urotropine, acetaldehyde cyanohydrin, lactic acid, benzoic acid, Sodalime, ethanoic acid, propanoic acid, electrolysis, Kolbe's electrolytic reaction, carbon dioxide, water, amides, alpha, halogen, phosphorus, weaker, stronger, ethyl alcohol, dibasic,monobasic, 2,2-dimethylpropanoic acid, `CH_(3)COCI`, acetic acid, `CH_(3)CH_(2)CH_(2)COOK`, enatiomers, diastereo, `K_(a)` `pk_(a)`, methanoic acid, higher, lower.)
Acetic acid on treatment with sodium carbonate liberates ............

Explanation

To solve the question "Acetic acid on treatment with sodium carbonate liberates __________," we need to analyze the reaction that takes place when acetic acid reacts with sodium carbonate.

### Step-by-Step Solution:

1. **Identify the Reactants**: The reactants in this case are acetic acid (CH₃COOH) and sodium carbonate (Na₂CO₃).

2. **Understand the Reaction**: When acetic acid reacts with sodium carbonate, it undergoes an acid-base reaction. Sodium carbonate is a basic salt that reacts with the acidic acetic acid.

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