Why Hydrogen fluoride(HF) is a weaker acid than HCl?
The acidic strength of hydrogen halide depends on the following factors:
1.Degree of dissociation ( How easily it will donate H+ ions)
Note:Acid is a substance that will donate H+ ions
More degree of dissociation = more acidic
Less degree of dissociation = less acidic
2. Type of bonding
Although all hydrogen halide having covalent bond but Hf have special type of bonding .i.e. Hydrogen bonding.
Due to H-bonding,HF is least acidic than HCl,HBr & HI.The hydrogen atom in HF is entrapped between two fluorine atoms & not easily available as proton(H+).
Increasing acidic order: HF ＜ HCl ＜ HBr ＜ HI
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