Question

Consider the following data for questions A-F: Two solutions of an unknown slightly soluble salt, A(OH),, were allowed to equilibrate- one at 25°C and the other at 80*C. A 15.00 mL-aliquot of each solution is titrated with 0.200 M HCI. 5.47 mL of the acid is required to reach the endpoint of the titration at 25 °C, while 67.04 mL mL are required for the 80 °C solution.

Answer 1

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At 25^oC, we have,

Ksp = 1.94 x 10-4

Also, universal gas constant,

R= 8.314 J/K.mol

Temperature, T=25^oC=25+273 K=298 K.

Therefore, Gibbs free energy is given by,

AG = -RT In K = -8.314 J/K.mol x 298 K x In(1.94 x 10-4)

:: AG = 21177.73 J/mol

We have,

1 J = 10-3 kJ

:: AG = 21177.73 x 10-3 kJ/mol

:: AG = 21.18 kJ/mol

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