Page 1 of 1

### 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?

### Re: Nernst Equation to find pH

Posted: Thu Feb 22, 2018 7:45 pm
At standard conditions, you can use the formula $E = E^{\circ} - (\frac{0.05916 V}{n})logQ$ 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.

### Re: Nernst Equation to find pH

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+]

### Re: Nernst Equation to find pH

Posted: Fri Feb 23, 2018 1:07 am
Find the concentration of H+ ions, and then take the negative log of that concentration.

### Re: Nernst Equation to find pH

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.

### Re: Nernst Equation to find pH

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.

### Re: Nernst Equation to find 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.