## The pH Scale

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Ben 1B
Posts: 55
Joined: Sat Aug 17, 2019 12:16 am

### The pH Scale

What do we need to know regarding the pH scale? Are there calculations or more conceptual types of problems?

Alex Tchekanov Dis 2k
Posts: 104
Joined: Sat Aug 24, 2019 12:16 am

### Re: The pH Scale

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

Sadhana_Dicussion_4A
Posts: 51
Joined: Sat Sep 07, 2019 12:19 am

### Re: The pH Scale

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.

Milisuryani Santoso 1L
Posts: 44
Joined: Thu Jul 11, 2019 12:15 am

### Re: The pH Scale

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.

alex_4l
Posts: 82
Joined: Thu Sep 26, 2019 12:18 am

### Re: The pH Scale

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

Lauren Sanchez 3D
Posts: 52
Joined: Sat Aug 24, 2019 12:17 am

### Re: The pH Scale

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?

Rosa Munoz 2E
Posts: 89
Joined: Wed Sep 18, 2019 12:21 am

### Re: The pH Scale

Just know the basics of how to calculate ph.

Shrayes Raman
Posts: 108
Joined: Sat Jul 20, 2019 12:15 am

### Re: The pH Scale

Know the how to calculate the pH ie -log() and pOH and know how to interpret results

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