Final answer:
Weak acids and bases are highly reversible which requires an equilibrium arrow, the given statement is A. true because weak acids and bases are highly reversible, meaning that they can easily go back and forth between their reactant and product forms.
Step-by-step explanation:
This is represented by an equilibrium arrow in chemical equations. In an equilibrium reaction, the reactants form the products, and the products can also react to reform the reactants. The equilibrium is reached when the rates of the forward and reverse reactions are equal.
For example, the ionization of a weak acid like HC₂H₂O₂ (acetic acid) is a reversible reaction:
HC₂H₂O₂ (aq) + H₂O (l) <=> H₃O⁺ (aq) + C₂H₃O₂⁻ (aq)
Similarly, weak bases can also undergo reversible reactions. The fact that weak acids and bases are highly reversible is important in understanding their behavior and the concept of acid-base equilibrium.
Therefore the given statement is A. true