Iron (Fe) is more reactive than gold (Au). (1) A student places a piece of Fe in

Question

Iron (Fe) is more reactive than gold (Au). (1) A student places a piece of Fe in 3 mL of 0.5M gold ID nitrate solution, Au Nos), Test Tube 1. In Test Tube 2, the student places a piece of Au in 3 mL of solution, Fe(NO3 2. In which test tube does the student see evidence of a reaction? Briefly explain The student is given a piece of lead (Pb) and a 0.5M lead(II) nitrate solution, Pb(NO3)2. The student discovers that Pb reacts with 0.5M Au(NO3)3 solution, but Pb does not react with 0.5M Fe(NO3)2 solution. Is Pb more or less reactive than Au? Than Fe? Briefly explain.

Explanation / Answer

1)When Fe piece put into the solution of Au(NO3)3,the following displacement reaction will tack place

Fe(s) + Au(NO3)3 -------> Fe(NO3)3(aq) + Au(s)

But when Au piece is placed into Fe(NO3)3 solution , No reaction will take place. From this we can under stand Fe is more reactive than Au

Standard reduction poterntial

Au3+(aq) + 3e -------> Au(s) E° = 1.52V

Fe3+ (aq) + 3e ------- > Fe(s) E° = -0.04V

Standard reduction potential indicate that Au is more like to being in elemental state comparing to Fe

2) Pb is more reactive than Au but less reactive than Fe

We can explain this by standard reduction potential

Fe2+(aq) + 2e --------> Fe(s) E° = -0.44V

Pb2+ ( aq) + 2e ---------> Pb(s) E° = -0.126V

Au3+(aq) + 3e -------> Au(s) E° = 1.52V

Standard electrode potential of Pb is higher than Fe but lower than Au i.e Pb is more likely to be in elemental state (less reactive ) than Fe but less likely to be in elemental state ( more reactive ) than Au

3) The decreasing reactivity order of Au,Fe and Pb is

Fe > Pb > Au

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