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The following species are given: i. HCO3− ii. H3O+ iii. HSO4− iv. H3O. Which of the following arrangements represents their increasing order of acid strength?
- iv < ii < iii < i
- ii < iii < i < iv
- i < iii < ii < iv
- iii < i < iv < ii
Correct answer: i < iii < ii < iv
Solution
The correct order reflects the increasing strength of acids based on their ability to donate protons; HCO3− is a weak acid, HSO4− is a stronger acid, H3O+ is a strong acid, and H3O is the strongest, thus the arrangement i < iii < ii < iv accurately represents this trend.
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