December 01, 2021, 02:21:27 AM
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Topic: pKa and Acid strength problem  (Read 261 times)

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Offline catsarecute02

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pKa and Acid strength problem
« on: October 08, 2021, 04:53:52 PM »
so i'm thinking A because of my pKa numbers but it also might be B?!?

Offline catsarecute02

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Re: pKa and Acid strength problem
« Reply #1 on: October 08, 2021, 04:54:29 PM »
i might be getting my pKa numbers wrong...

Offline Babcock_Hall

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Re: pKa and Acid strength problem
« Reply #2 on: October 08, 2021, 05:10:17 PM »
I think that your pKa for Ph-NH3+ is off a bit.  I am having a difficult time reading your pKa for thiol groups.  In my experience they often fall in the range 8-10.

Offline catsarecute02

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Re: pKa and Acid strength problem
« Reply #3 on: October 08, 2021, 05:19:43 PM »
my thiol group has 10.6

but would the answer be A or B?

Offline Babcock_Hall

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Re: pKa and Acid strength problem
« Reply #4 on: October 08, 2021, 05:26:05 PM »
What is the pKa of acetone?  If you know this value, then you should be fine.

Offline catsarecute02

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Re: pKa and Acid strength problem
« Reply #5 on: October 08, 2021, 05:40:22 PM »
19.3 and i put 19 so my answer of A is correct?

Offline Babcock_Hall

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Re: pKa and Acid strength problem
« Reply #6 on: October 08, 2021, 06:07:33 PM »
As far as I can tell, A has the correct order, but your pKa value for the anilinium ion is wrong by a good six orders of magnitude.

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