Chemistry

Problem

For the galvanic cell based on the reaction 2 Fe

^{3+}

+ Sn

^{2+}

→ 2 Fe

^{2+}

+ Sn

^{4+}

E^{\circ}=+0.15\,\text{V}

all solutions are at 298 K. At a particular moment the iron ion concentrations are

[\text{Fe}^{3+}]=0.020\,\text{M}

and

[\text{Fe}^{2+}]=0.20\,\text{M}

, and the measured cell potential is

+0.11\,\text{V}

. What is the value of the ratio

[\text{Sn}^{4+}]/[\text{Sn}^{2+}]

at this moment? a)

0.047

4.5

0.22

2.2