Question

To determine the enthalpy and entropy of dissolving a compound, you need to measure the K_sp at multiple Choose... . Then, plot In(Ksp) vs. Choose... . The slope of the plotted line relates to the Choose... of dissolving and the intercept of the plotted line relates to the Choose..., of dissolving.

Answer 1

To determine enthalpy and entropy of dissolving compound , you need to measure Ksp at multiple "Temperatures".

Then, plot ln(Ksp) vs "1/T". The slope of plotted line relates to the "- ΔHo/ R" or " enthalpy" of dissolving and the

intercept of plotted line relates to the "ΔSo/ R" or "entropy" of dissolving.

ΔGo = - RT ln Ksp --------------------> (1)

ΔGo =  ΔHo - T ΔSo ----------------> (2)

From equation (1) and (2) ,

- RT ln Ksp =  ΔHo - T ΔSo ------------------> (3)

ln Ksp = -ΔHo/RT + ΔSo/R

Plot of  ln Ksp vs 1/T,

Slope = -ΔHo/R

Intercept =  ΔSo/R