when you flip the equation for NO+H2O --> HNO2 + H+ +e- from its original form in the data table on the right, why didn't you flip the sign for V? like why isn't it 1.066-(-0.983) since we turned that NO equation around?

@RoxiHulet

Ай бұрын

Excellent question! The negative sign in the equation for calculating Ecell (Ecell = cathode - anode) is actually just there to flip the sign for the half reaction that is reversed. Great observation!

@nicholasyeoh5734

Ай бұрын

@@RoxiHulet Ok, so if the anode reduction reaction listed in the data table was already positive, then we still use Ecell = cathode - anode, but if anode reduction reaction was initially negative (and positive once we flip it to make it an oxidation reaction), then we just ignore that sign change. Correct me if I'm wrong, thanks!

@RoxiHulet

Ай бұрын

@@nicholasyeoh5734 🙃 You’re overthinking it, which is super common. You will never change the signs of the values in the table. Just plug them into the equation “cathode - anode”. The equation (subtracting the anode) changes the sign for you, so you don’t have to do it yourself.

Why does my E cell calculation always end up negative?

@RoxiHulet

Жыл бұрын

Maybe you have the anode and cathode backwards? Or, sometimes it is a negative number. If the reaction requires voltage instead of producing voltage, Ecell will be negative.

@gabriellemorgan9251

Жыл бұрын

@@RoxiHulet Thank you Roxi, they were indeed backwards. None of the problems I encountered in aleks had negative voltage, but I do see how that can be a real life possibility. :)