In which of the following aqueous solutions would you expectPbCl_2 to have the l

Question

In which of the following aqueous solutions would you expectPbCl_2 to have the lowest solubility? 0. 020 M KCI 0.012 M BaCl_2 0.015 M PbNO_3 pure water 0.015 M NaCl Of the following, only is not a state function. S H q E T For an isothermal process. Delta S = q q_rev/T q_rev T_q_rev q+w For a reaction with delta H degree = +137 kJ/mol and Delta S degree = +120 J/K/mol. This reaction is spontaneous at all temperatures spontaneous only at high temperature spontaneous only at low temperature nonspontaneous at all temperatures unable to determine without more information. If Delta G degree for a reaction is greater than zero, then K = 0 K = 1 K > 1 K

Explanation / Answer

1) The solubility will be least in the solution containing highest concentration of I-

[Cl-] in 0.02M KCl = 0.02 M

[Cl-] in 0.012M BaCl2 = 0.024 M

[Cl-] in 0.015 M NaCl = 0.015 M

So answer is BaCl2

2) Temperature is not a state function

3) for an isothermal process delta T= 0

S = qrev / T

4) Delta G = Delta H - T Delta S

a reaction is spontaneous if DeltaG < 0

Delta H = 137

Delta S = 120

Delta G = 137 - T X 0.120

137 < 0.120 T at very high temperature

so it will be spontaneous at very high temperature

5) Delta G = -RTlnK

rate constant < 1

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