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Question:
Which of the following is not a strong acid in aqueous solution?
a. HI
b. HF
c. HClO4
d. HCl
e. HBr
Answer:
The weak acid in the list is HF.
The strength of an acid has to do with how much it dissociates in solution. Acids which dissociate completely in solution are strong acids.
This dissociation depends on the strength of the H-X bond, were X is the atom bonded to the acidic hydrogen atom.
If the H-X bond is strong and short as in HF, this bond is not easily broken hence HF does not dissociate completely in solution hence it is a weak acid.
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