### Nernst Equation to find pH

Posted:

**Thu Feb 22, 2018 7:28 pm**I read through the book but I still don't understand how we use the Nernst Equation to find pH. Can someone please explain?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=142&t=28411

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Posted: **Thu Feb 22, 2018 7:28 pm**

I read through the book but I still don't understand how we use the Nernst Equation to find pH. Can someone please explain?

Posted: **Thu Feb 22, 2018 7:45 pm**

At standard conditions, you can use the formula to find the pH. The formula for ph is pH = -log[H+}, so you can find the concentration of hydrogen ions by the Nearst equation.The formula above is already converted from ln to log.

Posted: **Thu Feb 22, 2018 11:47 pm**

Yeah, if you solve for the concentration of H+ ions, you can then calculate the pH using the equation pH=log[H+]

Posted: **Fri Feb 23, 2018 1:07 am**

Find the concentration of H+ ions, and then take the negative log of that concentration.

Posted: **Sun Feb 25, 2018 9:54 pm**

Using the Nernst equation you can find the concentration of H+ ions which you can use to find pH. There was a homework problem that gave you pH and asked to find E, try looking at the solution for that if you're still confused.

Posted: **Mon Feb 26, 2018 1:35 pm**

you change the lnQ to 2.303logQ, as they are equivalent, and plug that into the equation. The -log[H+] will be the pH.

Posted: **Tue Mar 06, 2018 5:35 pm**

Since the pH is just a measure of the concentration of H ion concentration, we can use the Nernst equation to find it.