Sapling HW 10 Question 11

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Adam_Ventura_1H
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Sapling HW 10 Question 11

Postby Adam_Ventura_1H » Thu Dec 10, 2020 7:57 pm

I was not sure what category this question best fir so I decided to put it here since it has to do with acidity. My question was on how to know what oxoacid is the more acidic? This question gave the following oxoacids: HClO, HBrO, and HIO.

Vivian Hoang 1H
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Re: Sapling HW 10 Question 11

Postby Vivian Hoang 1H » Thu Dec 10, 2020 8:03 pm

The more electronegative the central atom attached to O is, the more polarized the O–H bond, and the more polarized the O–H bond, the more acidic the oxoacid is.

Brianna Martilla 1C
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Re: Sapling HW 10 Question 11

Postby Brianna Martilla 1C » Thu Dec 10, 2020 8:04 pm

Based on periodic table trends, an acid is weaker when their bond to H is stronger, because it is harder to give up an H+.

Chelsea_Guzman_3C
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Re: Sapling HW 10 Question 11

Postby Chelsea_Guzman_3C » Thu Dec 10, 2020 8:20 pm

Therefore, HCIO is considered to be the most acidic, while HIO is the least acidic.

Sofia Lombardo 2C
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Re: Sapling HW 10 Question 11

Postby Sofia Lombardo 2C » Sat Dec 12, 2020 12:26 pm

I also just wanted to add that since Cl is the most electronegative (out of Cl, Br, and I) it would stabilize the anion the most. The more stable the anion (conjugate base) is the stronger the acid is.

LarisaAssadourian2K
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Re: Sapling HW 10 Question 11

Postby LarisaAssadourian2K » Sat Dec 12, 2020 12:36 pm

Since all the acids are attached to an oxygen, we look at the electronegativity for acid strength rather than atomic size. Thus, HClO would be the strongest acid, and HIO would be the weakest, because Cl is the most electronegative.

rhettfarmer-3H
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Re: Sapling HW 10 Question 11

Postby rhettfarmer-3H » Tue Dec 15, 2020 10:07 pm

So, because the oxo-acids have the H attached to the O and not the halogen this causes a great difference in the stability of the molecule. Therefore, we look at the induction - which is the spread of the charge across the anion: which I really mean is the stability of the anion. It is key to note that these will have an overall negative charge. So we want to make the most stable anions. So, to pull the charge off the O we need a high electronegativity to pull thee away and stable across the whole membrane. So, the Cl will have the most electronegativity. Then Br and then I. SO the order is HCLO then HBrO and then HIO.


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