Help Solving a Puzzling Galvanic Cell Experiment!

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SUMMARY

The galvanic cell experiment involved a zinc half-cell with Zn(NO3)2 and an iron half-cell with Fe(NO3)3, resulting in a measured potential of 0.287V. The standard reduction potential for the iron reaction (Fe3+ + e- → Fe2+) is 0.77V, while for zinc (Zn → Zn2+ + 2e-) it is -0.76V. The expected potential based on standard values should be 1.53V, indicating a discrepancy in the experimental results that requires further investigation.

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supercali
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iwe had an expirament that goes like this
we made a galvanic cell with half cell zinc and its solution (Zn(NO3)2) and the other half cell was with iron and its solution (Fe(NO3)3) (the Fe solution with ions Fe+3) (both same concentration!) the potential i measured was 0.287V
now i just don't understand how can this be
because the standard potential of Fe+3 + e -> Fe+2 is 0.77V and for Zink it is -0.76V thus we should get in the experiment that the measured potential is 1.53V i just can't understand my result
help please
 
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