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### The pH Scale

Posted: Sun Dec 01, 2019 5:49 pm
What do we need to know regarding the pH scale? Are there calculations or more conceptual types of problems?

### Re: The pH Scale

Posted: Sun Dec 01, 2019 5:53 pm
We have only gone over the equation pH=-log(H+) and pH=-log(OH-) so I believe these are the only calculation (at least so far) that we will have to do regarding pH

### Re: The pH Scale

Posted: Sun Dec 01, 2019 6:03 pm
I think all we need to know is pH<7 is considered to be an acid, pH>7 is considered to be a base, and pH=7 is considered neutral. Also, I think we should know how to find the pH of a solution given the concentration, and vice versa.

### Re: The pH Scale

Posted: Sun Dec 01, 2019 7:32 pm
Additionally, I think it's good to know that pure water @ 25 degrees C is pH=7 (neutral) just for a reference on the test.

### Re: The pH Scale

Posted: Sun Dec 01, 2019 7:36 pm
My TA discussed the different aspects of pH that I think would be useful to understand for the final
pH -log [H+]
pH -log[OH-]
Ka= acid dissociation constant
Kb= base dissociation constant
PKa= -logKa
Pkb= -logKb
Kw= Ka X Kb (H+ X OH-)
and that pH + pOH will always = 14

### Re: The pH Scale

Posted: Sun Dec 01, 2019 8:54 pm
Sadhana_Dicussion_4A wrote:I think all we need to know is pH<7 is considered to be an acid, pH>7 is considered to be a base, and pH=7 is considered neutral. Also, I think we should know how to find the pH of a solution given the concentration, and vice versa.

How do we find the pH of a solution given the concentration?

### Re: The pH Scale

Posted: Sun Dec 01, 2019 9:28 pm
Just know the basics of how to calculate ph.

### Re: The pH Scale

Posted: Sun Dec 01, 2019 11:23 pm
Know the how to calculate the pH ie -log() and pOH and know how to interpret results