Question

multiple choice question
the equation shown here represents the dissolution of carbon dioxide in seawater. what do the double arrows represent?
co₂ + h₂o ⇌ h₂co₃ ⇌ hco₃⁻ + h⁺ or co₃²⁻ + 2h⁺

they indicate that the reactions move only to the right.
they indicate that the reactions move only to the left.
they indicate that the reactions can move in either direction.

Explanation:

In chemistry, double - arrows (⇌) in a chemical equation represent a reversible reaction, meaning the reaction can proceed in both the forward and reverse directions.

Answer:

They indicate that the reactions can move in either direction.