The following data used for both questions The solubility for PbCl_2 is determin

Question

The following data used for both questions The solubility for PbCl_2 is determined experimentally at different temperatures through a titration of the aqueous chloride ion and the data is used to calculate K_sp Temperature of saturated solution of PbCl_2 350.2 K 337.8 K 323.1 K 298.0 K K_sp for PbCl_2 5.16 times 10^-3 3.33 times 10^-3 1.81 times 10^-3 6.31 times 10^-4 Set the following two equations equal to each other and rearrange. What can be plotted as y versus x to provide a linear relationship? delta G degree = delta H degree - T delta S degree delta G degree = -RT in K_sp K_sp versus T 1/K_sp versus In T In K_sp versus T In K_sp versus 1/T Using the graph paper supplied at the end of the exam, determine the value of the delta H degree_rxn from the data given above problem #31. Choose the closest answer! 36.4 kJ 125 kJ 2.07 kJ 0.055 kJ

Explanation / Answer

31) Given that    Go = Ho - TSo   and Go = -RT ln Ksp

Then,

  Ho - TSo = -RT ln Ksp

   -RT ln Ksp = Ho - TSo

   ln Ksp = (Ho/ -RT ) - (TSo/-RT)

ln Ksp = (- Ho/R)(1/T) + (So/R)

y = mx + c

y = In Ksp , x = 1/T

In Ksp versus 1/T

Therefore,

ans = d

  

  

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