Need Answers From Q3-12 I now it\'s very much but I need answered of all questio

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Need Answers From Q3-12
I now it's very much but I need answered of all questions it's important

Given : E (Cu Cu) -0.34 V A zinc electrode is placed in a 0.1 M solution at 25°C. Assuming that the salt is 20% dissociated at this dilutions calculate the electrode potential. Eo (Zn2+/Zn)--0.76% Q.3 Q4 From the standard potentials shown in the following diagram, calculate the potentials Ei and E, Q.5 Calculate the EMF of the following cell Zn| Zn2 (0.01M)||Zn2 (0.1 M)| Zn at 298 K Q.6 Calculate the EMF of the cell, Zn-Hg(c,M)|Zn2+ (aq) Hg-Zn(c,M) at 25 C. if the concentrations of the zinc amalgam are: c,-10g per 100g of mercury and c2 lg perl00 g of mercury Calculate pH using the following cell Pt (H,) | H+ (x M) 1 1 H+ (1 M) I Pt (HJ if Ece,-0.2364 V Q.7 1 atm 1 atm Q.8 Calculate the equilibrium constant for the reaction Q.9 Calculate the equilibrium constant for the reaction Fe + Cuso, Feso,+ Cu at 25°Cc. Eo (CuCu2)--033TV Given Eo (Fe/Fe2+)-0.44V, The standard reduction potential at 25°C for the reduction of water 2H2O +2et H 2+20H is 0.8277 volt. Calculate the equilibrium constant for the reaction Q.10 2H,O HOOH at 25°C. Q.11 At 25°C the value of K for the equilibrium Fe3+ Ag Fe2+ +Agt is 0.53 1mol/litre. The standard electrode potential for AgeAg is 0.799V. What is the standard potential for Fe e Fe2+? For the reaction, 4A1(s) + 30,(g) + 6H2O + 4 OH-# 4 [Al(OH).] ; ? Eeell_ 2.73 V. If [Al (OH),1. Q.12 (OH-) = 157 kJ mo 1-1 and AG f (H2O)--23 7.2 kJ mol-1, determine ? VMC

Explanation / Answer

Ans 3

Concentration of zinc solution = 0.1 M

% salt dissociated = 20% = 0.20

Concentration of Zn2+ = 0.1 x 0.20 = 0.020 M

The reduction reaction

Zn2+ + 2e- = Zn

E°cell = - 0.76 V

From the Nernst equation

E = E°cell - (0.0591/2) x log (1/[Zn2+])

= - 0.76 - (0.0591/2) x log (1/0.020)

= - 0.76 - (0.0591/2) x 1.69897

= - 0.76 - (0.0502)

= - 0.8102 V

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