## Nernst Equation to find pH

$E_{cell} = E_{cell}^{\circ}-\frac{RT}{nF}\ln Q$

Miranda 1J
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Joined: Fri Sep 29, 2017 7:06 am

### Nernst Equation to find pH

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

Cooper1C
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

### Re: Nernst Equation to find pH

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.

Phillip Winters 2F
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Joined: Fri Sep 29, 2017 7:05 am

### Re: Nernst Equation to find pH

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

Mitch Walters
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Joined: Fri Sep 29, 2017 7:07 am

### Re: Nernst Equation to find pH

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

Max Mazo 2C
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Joined: Fri Sep 29, 2017 7:06 am

### Re: Nernst Equation to find pH

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.

Shreya Ramineni 2L
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

### Re: Nernst Equation to find pH

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

diangelosoriano
Posts: 49
Joined: Fri Sep 29, 2017 7:07 am

### Re: Nernst Equation to find pH

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

Return to “Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)”

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