HClO vs. HBrO vs. HIO example

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Anirudh Mahadev 1G
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HClO vs. HBrO vs. HIO example

Postby Anirudh Mahadev 1G » Fri Dec 04, 2020 11:08 am

In the example comparing the pH of HClO, HBrO, and HIO, why is the halogen the atom that receives the electrons and makes the anion more stable if Oxygen is more electronegative? Wouldn't oxygen have a stronger pull on the electrons than the halogens?

Andrew Wang 1C
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Re: HClO vs. HBrO vs. HIO example

Postby Andrew Wang 1C » Fri Dec 04, 2020 11:16 am

The oxygen atom is common across all three compounds, so you wouldn't use it to compare them to each other. Instead, we use the halogens because they are different in each compound and therefore comparable.

Libby Dillon - 1A
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Re: HClO vs. HBrO vs. HIO example

Postby Libby Dillon - 1A » Fri Dec 04, 2020 11:21 am

While oxygen is the most electronegative of the atoms shown, it is not what is being compared in this example. Each compound includes oxygen, so instead you compare the anions by the presence of Cl, Br, and I. Since Cl has the highest electronegativity of the three, it stabilizes the negatively charged oxygen by withdrawing electron density and therefore is the strongest acid.

claire ikemiya_2I
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Re: HClO vs. HBrO vs. HIO example

Postby claire ikemiya_2I » Fri Dec 04, 2020 12:25 pm

While oxygen is more electronegative, it is not taken into account when comparing all 3 compounds because oxygen is present in each one.

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