alleryStart learning →A double arrow is used in an acid equation to indicate that the acid is:
AA solid that will not dissolve
BA gas escaping the solution
CWeak and not fully reacted
DStrong and fully reacted
Answer & Solution
Correct answer: C. Weak and not fully reacted
1. A single arrow implies the reaction runs essentially to completion.
2. A double arrow instead shows an equilibrium between reactants and products.
3. A double-arrow is appropriate in a given equation because it indicates the acid is a weak acid that has not reacted completely.
4. Strong acids and bases are written with a single arrow.
5. The symbol carries chemical meaning rather than being decoration.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 4 'Stoichiometry of Chemical Reactions', sections 4.1-4.5_
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