pH vs. pOH

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

pH vs. pOH

Postby ngarcia » Fri Nov 29, 2019 2:41 pm

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

Postby MingdaH 3B » Fri Nov 29, 2019 2:42 pm

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
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Joined: Wed Sep 11, 2019 12:15 am

Re: pH vs. pOH

Postby claribel charway 1I » Fri Nov 29, 2019 3:40 pm

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

Postby Tiffany Chao 2H » Fri Nov 29, 2019 3:40 pm

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

RoshniVarmaDis1K
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Joined: Sat Aug 24, 2019 12:16 am

Re: pH vs. pOH

Postby RoshniVarmaDis1K » Fri Nov 29, 2019 4:11 pm

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

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

Re: pH vs. pOH

Postby Emma Popescu 1L » Fri Nov 29, 2019 9:20 pm

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

Postby BCaballero_4F » Fri Nov 29, 2019 11:57 pm

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

HuyHa_2H
Posts: 100
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Re: pH vs. pOH

Postby HuyHa_2H » Sat Nov 30, 2019 7:47 am

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
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Joined: Sat Sep 14, 2019 12:15 am

Re: pH vs. pOH

Postby William Chan 1D » Sat Nov 30, 2019 5:53 pm

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

Postby 505106414 » Mon Dec 02, 2019 8:17 pm

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
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Joined: Sat Jul 20, 2019 12:15 am

Re: pH vs. pOH

Postby Claire Stoecklein 1E » Thu Dec 05, 2019 9:52 pm

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
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Joined: Fri Aug 02, 2019 12:16 am

Re: pH vs. pOH

Postby Ying Yan 1F » Fri Dec 06, 2019 7:24 pm

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
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Joined: Sat Sep 14, 2019 12:15 am

Re: pH vs. pOH

Postby ranqiao1e » Fri Dec 06, 2019 11:37 pm

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

Catherine Daye 1L
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Re: pH vs. pOH

Postby Catherine Daye 1L » Sat Dec 07, 2019 2:06 am

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

Postby chrischyu4a » Sat Dec 07, 2019 4:23 pm

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

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

Re: pH vs. pOH

Postby Lauren Sanchez 3D » Sun Dec 08, 2019 1:03 am

To add on, pH + pOH = 14

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

Re: pH vs. pOH

Postby Anna Heckler 2C » Sun Dec 08, 2019 2:03 am

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

Varadhan_3G
Posts: 49
Joined: Wed Sep 18, 2019 12:20 am

Re: pH vs. pOH

Postby Varadhan_3G » Mon Dec 09, 2019 1:29 am

What is the relationship between pka and ph? Which equation do we use to go between them? Thank you.


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