Consider the following list: Mg Mg^2+ I_2 I^- Co^3+ Co^2+ CL_2 Cl^- Which is the

Question

Consider the following list: Mg Mg^2+ I_2 I^- Co^3+ Co^2+ CL_2 Cl^- Which is the strongest reducing agent? Which is the weakest oxidizing agent? Which is the strongest oxidizing agent? Which is the weakest reducing agent? For the redox reaction H_2O_2 + 2 I^- + 2 H^+ rightarrow 2 H_2O + I_2 calculate E degree. calculate the value of the equilibrium constant at 25 degree C. Calculate the K_sp of PbSO_4 using the table of standard reduction potentials What is the voltage at 25 degree C for the voltaic cell of Ni and Ag electrodes if the Ni electrode is dipped into a solution of 0.050 M NiCL_2 and the Ag electrode is dipped into a solution of 2.0 M AgNO_3.

Explanation / Answer

Co3+ +e- ----> Co2+ E0 = 1.82 V

Cl2 + 2e- ------> 2Cl- E0 = 1.36 V

I2 + 2e- ------> 2I- E0 = 0.54 V

Mg2+ + 2e- -----> Mg E0 = -2.37 V

The species with greater reduction potential gets reduced easily, so it acts as a stronger oxidizing agent. Co3+ strongest oxidizing agent

The species with lower reduction potential gets oxidized easily and so acts as a stronger reducing agent.

Mg2+ strongest reducing agent

2) The given reaction : H2O2 + 2 I- + 2 H+ ------> 2 H2O + I2

We know that H2O2 is getting reduced and I^- is oxidized

Ecell0 = E cathode - E anode = 1.78 V - 0.54 V = 1.24 V

We know that

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