If solid lead PbI 2 is not soluble in water, what does that mean about the syste

Question

If solid lead PbI2 is not soluble in water, what does that mean about the system? Select all that are true.

A) The sign of G is negative

B) The sign of G is positive

C)The forces that hold PbI2 together must be strong compared to the forces between water and Pb2+ and I- ions.

D) The forces that hold PbI2 together must be weak compared to the forces between water and Pb2+ and I- ions.

E) Hº for this process must be negative

F) Hº for this process must be positive

G) Hº for this process could be negative or positive.

Explanation / Answer

B) The sign of G is positive (Because the process is non-spontaneous)

C)The forces that hold PbI2 together must be strong compared to the forces between water and Pb2+ and I- ions (The force on ions is weak from water, hence no dissociation)

F) Hº for this process must be positive (Requires energy for breaking bonds in PbI2)

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