Use the information given below to calculate the lattice energy of calcium chlor

Question

Use the information given below to calculate the lattice energy of calcium chloride. Calculate the osmotic pressure at 25 degree C across a semipearmiable membrane seperating seawater (1.4 M total particles) from a 0.44 M solution of aqueos Nacl. A lead-acid automative battery consists of voltaic cells in series. The cathode of each cells consisits of lead dioxide (PbO2) packed in metal grid, the anode of each cells is composed of lead, Both The half-reactions for this battery are: pbo2(s)+HSO4-(aq)+2e- rightarrow PbSO4(s)+2H2O(f) = + 1.685V PbSO4(s)+H (aq)+2e- rightarrow pb(s)+HSO4-(aq) = - 0.356V Write the net ionic equation for the cell reaction. Calculate the value of E degree for this cell. Use appropriate standard reduction potentials to calculate the value of k at 25 degree C for the reaction NiO2(s)+2Cl-(aq) rightarrow Cl2(g)+Ni2(aq)+2H2O(l) Calculate the equiliberium concentration of ag(aq) in a solution that is intialy 0.190 MAgNO3 and 0.980 MNH3. and in which the following reaction takes place: Ag+(aq) + 2 NH3(aq) Ag[NH3]+(aq) kf = 1.7 times 10

Explanation / Answer

Standard reduction potentials: Pb4+ /Pb2+ = +1.67 V   and Pb2+/Pb = -0.36 V

Eo = Eo (cathode, reduction) - Eo (anode, oxidation)

= 1.67 - (0.36)

= 2.03 V

Ag+    + 2NH3   = Ag(NH3)2 +

0.19M      0.98M        0                   .....   initial

-x        -2x              x              ..... change

So, formation constant = [Ag(NH3)2+] / [Ag+] [NH3]2

= x / (0.19 - x) (0.98 - 2x)2 = 1.7 x 107

Solve for x now.

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