Chemistry / Unit 12 Chem 2320 short lesson, about 20 seconds
Nonmetal Hydride Acid Strength Trend
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The idea
Nonmetal hydride acid strength rises left to right across a period and down a group, tracking electronegativity and bond weakness.
In practice
Hydrogen fluoride is weaker than hydrogen chloride, and ammonia is weaker than water.
Where people slip
Assuming HF is the strongest hydrohalic acid because fluorine is most electronegative mistakes a period trend for the group trend, where weaker bonds make HF the weakest.
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