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### Topic: pH<0 and pH>14?  (Read 1583 times)

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#### hahaha7

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##### pH<0 and pH>14?
« 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?

#### billnotgatez

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##### Re: pH<0 and pH>14?
« Reply #1 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?

#### curiouscat

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##### Re: pH<0 and pH>14?
« Reply #2 on: November 10, 2014, 11:37:20 AM »
Change Temperature?

#### Borek

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##### Re: pH<0 and pH>14?
« Reply #3 on: November 10, 2014, 03:33:25 PM »
Is it possible for having cases where the pH is less than 0 and pH greater than 14?

Definitely.

Quote
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?
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