Under standard conditions, what reaction occurs, if any, when each of the following operations are performed? For the reactions that occur, write a balanced, net ionic equation and calculate ℰ°, ΔG°, and K at 25°C. (Use the lowest possible coefficients. Include states-of-matter at 25°C and 1 atm in your answer. If an answer does not exist, enter DNE.)
a. Cl2 gas is bubbled into a solution of NaI.
______________________________
ℰ° | ____ V |
ΔG° | ____ kJ |
K |
b. An acidic solution of FeSO4 is exposed to air.
______________________________
ℰ° | ____ V |
ΔG° | ____ kJ |
K |
Part a.
Cl2(g) + 2NaI(aq) ----> I2(s) + 2NaCl(aq)
Net ionic equation: Cl2(g) + 2I-(aq) ----> I2(s) + 2Cl-(aq)
Eocell = EoCl2/Cl- - EoI2/I- = 1.36 V - 0.54 V = 0.82 V
The positive value of Eocell indicates that the cell reaction is spontaneous.
Go =
-nFEocell = -2*96500 C * 0.82 V =
-158260 J or -158.26 kJ
Go =
-RT ln(K)
i.e. -158260 J/mol = -8.314 J/mol.K * 298 K * ln(K)
i.e. ln(K) = 63.877
i.e. K = e63.877 = 5.51*1027
Part b.
Net ionic equation: 2Fe2+ + 2H+ ----> 2Fe3+(aq) + H2 (DNE)
Eocell = EoFe2+/Fe3+ - EoH+/H2 = -0.77 V - 0 V = -0.77 V
The negative value of Eocell indicates that the cell reaction is nonspontaneous.
Go =
-nFEocell = -2*96500 C * (-0.77 V) =
148610 J or 148.61 kJ
Go =
-RT ln(K)
i.e. 148610 J/mol = -8.314 J/mol.K * 298 K * ln(K)
i.e. ln(K) = -59.982
i.e. K = e-59.982 = 8.91*10-27
Under standard conditions, what reaction occurs, if any, when each of the following operations are performed? For the reactions that occur, write a balanced, net ionic equation and calculate ℰ°, ΔG°,...
Under standard conditions, what reaction occurs, if any, when each of the following operations are performed? For the reactions that occur, write a balanced, net ionic equation and calculate ℰ°, ΔG°, and K at 25°C. (Use the lowest possible coefficients. Include states-of-matter at 25°C and 1 atm in your answer. If an answer does not exist, enter DNE.) a. Cl2 gas is bubbled into a solution of NaI. ______________________________ ℰ° ____ V ΔG° ____ kJ K b. An acidic solution of...
AP Chemistry - redox reactions electrochemistry
Write the balanced net ionic equation for the reaction that occurs when each of the following combinations from Part I (the seventeen known solutions) is tried. In some cases, the reaction is difficult to detect and you may not have observed a reaction. Record the observati ons that you actually made in the data table so that you can compare your unknowns with your ac observations. However, write a balanced net ionic equation in each of the following cases, even...