Page 1 of 1

2009 final 4E

Posted: Fri Mar 11, 2016 2:26 am
by 904565142
Can someone please explain how they jumped from Q to log[H+]?

Re: 2009 final 4E

Posted: Fri Mar 11, 2016 8:44 am
by Jacqueline Lee
I think it's because we're looking for pH and the concentrations of Ce3+, Ce4+,MnO4-, and Mn2+ would not contribute to pH because pH is the measure in concentration of H+ so that is what we could focus on instead.

So by taking the E (which would be .157) you can divide that by (.05916/5) and then divide by 8(which came from the exponent of [H] via log rules) and that's how the course reader got the
1.67=log[H+]

Hope that helped