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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: hahaha7 on November 10, 2014, 08:21:52 AM

Title: pH<0 and pH>14?
Post by: hahaha7 on November 10, 2014, 08:21:52 AM

Is it possible for having cases where the pH is less than 0 and pH greater than 14?
I thought of an example for pH < 0, where you have a 12 M HCl solution to give a pH of -log(12) = -1.08
How about for pH > 14? I cant think of an example to illustrate this. Could anyone help me out with this?
Thanks for your *delete me*

Title: Re: pH<0 and pH>14?
Post by: billnotgatez on November 10, 2014, 08:57:40 AM

I am wondering what 399.971 grams of Sodium Hydroxide in 1 liter would give you what pH?

Title: Re: pH<0 and pH>14?
Post by: curiouscat on November 10, 2014, 11:37:20 AM

Change Temperature?

Title: Re: pH<0 and pH>14?
Post by: Borek on November 10, 2014, 03:33:25 PM

Quote from: hahaha7 on November 10, 2014, 08:21:52 AM

Is it possible for having cases where the pH is less than 0 and pH greater than 14?

Definitely.

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I thought of an example for pH < 0, where you have a 12 M HCl solution to give a pH of -log(12) = -1.08

Good thinking, just beware - in concentrated solutions things stop being what you think they are. pH of 12 M HCl is definitely negative, but it is also definitely not just -1.08.

Compare http://www.chembuddy.com/?left=pH-calculation&right=ionic-strength-activity-coefficients

Quote

How about for pH > 14? I cant think of an example to illustrate this. Could anyone help me out with this?

See billnotgatez post. How is pH linked with pOH?