How Does Electrolysis Affect pH in a HBr Solution?

[harrietstowe]

Homework Statement

A current of 10.7 Amps is applied to a 1.30 L solution of 0.550M HBr converting some of the H+ to H2(g), which bubbles out of solution. What is the PH of the solution after 77 minutes.

Homework Equations

The Attempt at a Solution

(10.7 C/s)(1 mol e/96485 C)(2 mol H+/2 mol e)(60s/min)(77 min) = .512 mol H+

.512 mol H+/1.30L = .394M H+
-log(.394M) = .405 = PH

This was incorrect

 

[pmsrw3]

You started with a certain amount of H+ in the solution. The electrolysis removed some. Now you need to calculate what's left.

 

[harrietstowe]

I see will try, thank you

 

[harrietstowe]

It worked, thank you