Binary Acids with H

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Lisa Werner 2F
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Joined: Fri Sep 28, 2018 12:17 am

Binary Acids with H

Postby Lisa Werner 2F » Sat Dec 08, 2018 5:46 pm

In the textbook, it says if A (the element bonded to H) is more electronegative, then the acid will be stronger. However, this rule doesn't work considering between HF and HCl, F is more electronegative than Cl, but HF is a weaker acid than HCl. Why does the rule not apply?

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Joined: Fri Sep 28, 2018 12:15 am

Re: Binary Acids with H

Postby aisteles1G » Sat Dec 08, 2018 6:40 pm

It is different when going across a period and going down a group. Across a period, you are correct, the more electronegative one makes a stronger acid. However going down a group, the larger one with the bigger atomic radii is the stronger acid. That is why HF is less than HCl. The strength of the acid both depends on electronegativity and atomic radii.

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