Negative pH

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Sara Lakamsani 4D
Posts: 45
Joined: Thu Sep 27, 2018 11:29 pm

Negative pH

Postby Sara Lakamsani 4D » Tue Jan 15, 2019 9:17 pm

Can be pH be negative? If the concentration of H+ is over 1, then the -log of it would be negative right?

Emmaraf 1K
Posts: 73
Joined: Fri Oct 19, 2018 11:16 pm

Re: Negative pH

Postby Emmaraf 1K » Tue Jan 15, 2019 9:25 pm

Correct.

Chris Freking 2G
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Joined: Thu Sep 27, 2018 11:29 pm

Re: Negative pH

Postby Chris Freking 2G » Tue Jan 15, 2019 9:28 pm

pH can be negative if the concentration of H+ ions have a molarity over 1.

See viewtopic.php?t=24564

Patrick Cai 1L
Posts: 77
Joined: Thu Sep 27, 2018 11:25 pm

Re: Negative pH

Postby Patrick Cai 1L » Tue Jan 15, 2019 11:53 pm

For most intents, I think we will not be using such cases of superacids, as these are rather rare anomalies as compared to the scope of Chem 14B.

Shreya_Bharadwaj_1D
Posts: 15
Joined: Thu Sep 27, 2018 11:22 pm

Re: Negative pH

Postby Shreya_Bharadwaj_1D » Wed Jan 16, 2019 1:13 am

Most acids that we use in class will probably be from 0 to 14 on the pH scale and we are unlikely to run into any "superacids" that have negative pHs

taryn_baldus2E
Posts: 50
Joined: Thu Sep 27, 2018 11:24 pm

Re: Negative pH

Postby taryn_baldus2E » Wed Jan 16, 2019 11:06 am

This would be known as a superacid, which will not be commonly presented or mentioned in this chemistry course due to its lack of presence in biology.

Samantha Chang 2K
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Joined: Thu Sep 27, 2018 11:17 pm

Re: Negative pH

Postby Samantha Chang 2K » Wed Jan 16, 2019 12:36 pm

pH can be negative, but in class it the pH utilized will mostly be in the range of 0-14. pH can be negative with super acids!

ran2000
Posts: 60
Joined: Thu Sep 27, 2018 11:15 pm

Re: Negative pH

Postby ran2000 » Wed Jan 16, 2019 1:09 pm

True. Professor Lavelle referred to these acids as super acids.

Nicolle Fernandez 1E
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Been upvoted: 1 time

Re: Negative pH

Postby Nicolle Fernandez 1E » Wed Jan 16, 2019 3:57 pm

Yes a pH can be negative and these are known as superacids, but we will most likely not be dealing with them.

Kyither Min 2K
Posts: 48
Joined: Tue Oct 02, 2018 11:15 pm

Re: Negative pH

Postby Kyither Min 2K » Fri Jan 18, 2019 11:10 am

Yes, pH can be negative since pH is just the -log of the concentration of hydronium. pH can also exceed 14.

madisondesilva1c
Posts: 73
Joined: Thu Sep 27, 2018 11:16 pm

Re: Negative pH

Postby madisondesilva1c » Fri Jan 18, 2019 3:21 pm

If we encounter a problem where pH is negative, are we supposed to note that this is a super acid? Or is notation not required?

Nikki Bych 1K
Posts: 35
Joined: Thu Sep 27, 2018 11:16 pm

Re: Negative pH

Postby Nikki Bych 1K » Fri Jan 18, 2019 7:49 pm

Unless the question pertains to identifying what substance it is, we probably won't be asked to identify a superacid/base.


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