Friday lecture

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Friday lecture

Postby Adrienne_4F » Mon Feb 25, 2019 7:23 pm

In our notes when we're finding E cell, why is the answer .43V even though we have cathode as .77V and anode as -.34 V? shouldn't it be .77-(-.34)=?

Posts: 68
Joined: Fri Sep 28, 2018 12:27 am

Re: Friday lecture

Postby alanaarchbold » Mon Feb 25, 2019 7:31 pm

since the anode was reversed and the sign changed, we add -.34 and .77. However, if we didn't reverse it, it would be .77-.34, which would give the same answer. Basically, if you use the voltage from the original voltages given, you subtract it. If you use the reverse anode reaction voltage, you add it.

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