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Chemistry Paper4

Youme&I

Youme&I

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mrpaudel said:
Help me out with question number 1)a)ii)....i got the answer 2.13V...dont know how ms got the other answer,,,some1 plz help,!!!


http://www.xtremepapers.me/CIE/Internat ... 8_qp_4.pdf
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hey there, ur answer seems to be wrong, this is because electrons always travel from negative to positive.

Eo of Fe3+ =0.77 , Eo of Cl2 = +1.36 , this show that the Fe3+ is less positive than Cl2 therefore Fe3+ acts as negative side.
I give u a simple formula my teacher taught me. To calculate the Eo cell = Eo (positive) - Eo (negative) = 1.36-0.77 =0.59v

You may use the other method which is using the equations. But it much easier using the formula I tell you before. It ONLY can be use to calculate Eo cell only! NOTE: remember which are positive and negative!
 
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