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HF is a weak acid due to the fact that it has a short and strong bond. For example HI is a stronger acid due to the fact that it has a large atomic radius and a short bond length, making it easier to break apart. Since HF has a smaller atomic bond it has a longer bond length making it more difficult to break, thus making it a weaker acid.
This was one of the homework problems (12.51) where HF was a weaker acid than HCl, but in another part of that problem, it stated that HClO2 is a stronger acid than HBrO2 because Cl is more electronegative. So, why is HF a weaker acid if F is more electronegative than Cl?
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