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Negative pH

Posted: Tue Jan 15, 2019 9:17 pm
by Sara Lakamsani 4D
Can be pH be negative? If the concentration of H+ is over 1, then the -log of it would be negative right?

Re: Negative pH

Posted: Tue Jan 15, 2019 9:25 pm
by Emmaraf 1K
Correct.

Re: Negative pH

Posted: Tue Jan 15, 2019 9:28 pm
by Chris Freking 2G
pH can be negative if the concentration of H+ ions have a molarity over 1.

See viewtopic.php?t=24564

Re: Negative pH

Posted: Tue Jan 15, 2019 11:53 pm
by Patrick Cai 1L
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.

Re: Negative pH

Posted: Wed Jan 16, 2019 1:13 am
by Shreya_Bharadwaj_1D
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

Re: Negative pH

Posted: Wed Jan 16, 2019 11:06 am
by taryn_baldus2E
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.

Re: Negative pH

Posted: Wed Jan 16, 2019 12:36 pm
by Samantha Chang 2K
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!

Re: Negative pH

Posted: Wed Jan 16, 2019 1:09 pm
by ran2000
True. Professor Lavelle referred to these acids as super acids.

Re: Negative pH

Posted: Wed Jan 16, 2019 3:57 pm
by Nicolle Fernandez 1E
Yes a pH can be negative and these are known as superacids, but we will most likely not be dealing with them.

Re: Negative pH

Posted: Fri Jan 18, 2019 11:10 am
by Kyither Min 2K
Yes, pH can be negative since pH is just the -log of the concentration of hydronium. pH can also exceed 14.

Re: Negative pH

Posted: Fri Jan 18, 2019 3:21 pm
by madisondesilva1c
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?

Re: Negative pH

Posted: Fri Jan 18, 2019 7:49 pm
by Nikki Bych 1I
Unless the question pertains to identifying what substance it is, we probably won't be asked to identify a superacid/base.

Re: Negative pH

Posted: Sat Mar 16, 2019 10:00 pm
by Sara Lakamsani 4D
Thanks for all your responses!