## pH vs. pOH

ngarcia
Posts: 50
Joined: Thu Jul 11, 2019 12:17 am

### pH vs. pOH

Can someone please explain the difference between pH and pOH?

MingdaH 3B
Posts: 133
Joined: Thu Jul 11, 2019 12:17 am

### Re: pH vs. pOH

pH measures the amount of H+ molecules in solution while pOH measures the amount of OH molecules. Basically, the higher the pH, the lower the pOH, and the more acidic. Vice versa, the higher the pOH, the lower the pH, and the more basic a solution is.

claribel charway 1I
Posts: 55
Joined: Wed Sep 11, 2019 12:15 am

### Re: pH vs. pOH

pH is a measure of acidity, specifically it measures the H+ ions. pOH is a measure of basicity, specifically the OH ions. Their respective values are inverse of each other. For example, ph of 0 is a pOH of 14.

Tiffany Chao 2H
Posts: 117
Joined: Fri Aug 09, 2019 12:17 am

### Re: pH vs. pOH

To add onto Mingdah, pH and pOH have an inverse relationship.

Posts: 51
Joined: Sat Aug 24, 2019 12:16 am

### Re: pH vs. pOH

pH measures the concentration of H3O+ ions while pOH measure the concentration of OH- ions.

Emma Popescu 1L
Posts: 105
Joined: Wed Sep 11, 2019 12:16 am

### Re: pH vs. pOH

If you have the pH of a solution, you can calculate its pOH or vice versa. For example, if the pH is 2 then the pOH will be 14-2=12

BCaballero_4F
Posts: 94
Joined: Wed Nov 14, 2018 12:22 am

### Re: pH vs. pOH

pH measures acidity while pOH measures basicity, and you can use one to get the other

HuyHa_2H
Posts: 100
Joined: Wed Sep 11, 2019 12:15 am

### Re: pH vs. pOH

pH measures acidity whereas pOH measures basicity. Both are primarily measured on a scale from 0-14 so if the pH is 4 then the pOH is 10 and so on.

William Chan 1D
Posts: 102
Joined: Sat Sep 14, 2019 12:15 am

### Re: pH vs. pOH

In most circumstances, we measure pH of a solution. It makes things easier/more standard, but we can also measure pOH.

Just as pH is defined by -log[H+], pOH is defined by -log[OH-].

Because of the equilibrium constant of water, pH and pOH have an inverse relationship. pH = 14 - pOH, and pOH = 14 - pH.

This happens because of the equilibrium constant of water. At 25°C, Kw = 10^-14.
kw = [H+][OH-]

505106414
Posts: 55
Joined: Wed Sep 18, 2019 12:17 am

### Re: pH vs. pOH

Emma Popescu 3D wrote:If you have the pH of a solution, you can calculate its pOH or vice versa. For example, if the pH is 2 then the pOH will be 14-2=12

Just to clarify, they always add to 14?

Claire Stoecklein 1E
Posts: 49
Joined: Sat Jul 20, 2019 12:15 am

### Re: pH vs. pOH

505106414 wrote:
Emma Popescu 3D wrote:If you have the pH of a solution, you can calculate its pOH or vice versa. For example, if the pH is 2 then the pOH will be 14-2=12

Just to clarify, they always add to 14?

Yes, they always add up to 14

Ying Yan 1F
Posts: 101
Joined: Fri Aug 02, 2019 12:16 am

### Re: pH vs. pOH

pH calculates is the amount of H+ in a solution while pOH calculates the amount of OH-. Both utilizes -log to determine their concentration, however, for pOH, you must subtract the value you get from the -log[OH-] to get the correct answer. I hope that helped!

ranqiao1e
Posts: 51
Joined: Sat Sep 14, 2019 12:15 am

### Re: pH vs. pOH

Ph measures acidity of the solution, and POh measure how basic the solution is. P stands for the -log of []

Catherine Daye 1L
Posts: 104
Joined: Wed Sep 11, 2019 12:16 am

### Re: pH vs. pOH

pH indicates the concentration of hydronium, while pOH indicates the concentration of hydroxide. You can think of them as the extent of acidity and basicity (respectively).

chrischyu4a
Posts: 52
Joined: Thu Jul 25, 2019 12:16 am

### Re: pH vs. pOH

pH is a measure of hydrogen ion concentration while pOH is a measure of hydroxide ion concentration.

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

### Re: pH vs. pOH

To add on, pH + pOH = 14

Anna Heckler 2C
Posts: 102
Joined: Wed Sep 18, 2019 12:18 am

pH = -log[H+]
pOH = -log[OH-]