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Can you help me understand this Chemistry question?

This experiment uses two common substances as the reactants: Acetic acid (HC₂H₃O₂) otherwise known as common household white vinegar and sodium carbonate (Na₂CO₃) often known as washing soda. Products of the reaction are sodium acetate (NaC₂H₃O₂), carbon dioxide, and water. To form carbon dioxide and water, the first hydrogen of the acetic acid reacts with the carbonate of the sodium carbonate. Sodium acetate is soluble in water. Please find the attached file for more info