Solubility of Borax in room temperature solution is 0.1260 Solubility of Borax i

Question

Solubility of Borax in room temperature solution is 0.1260

Solubility of Borax in ice bath solution is 0.06523

Question 1: In which solution is Borax more soluble, the room temperature solution or the ice bath solution? Please explain.

Solubility equilibrium constant Ksp1 of Borax = 0.008 with recorded temperature of 292K

Solubility equilibrium constant Ksp2 of Borax = 0.00111 with recorded temperature of 278K

Question 2: From these results, calculate the enthalpy change in kJ/mol. R=8.314 J/mol. Please show work.

Question 3: Is the process of forming borax-borate solution in water endothermic or exothermic? Please explain.

Question 4: Comparing the above two values for the solubility equilibrium constants at the two different temperatures. Are the results consistent with LeChatelier's Principle? Please explain why or why not.

Thank you in advance for any the assistance you can provide me.

Explanation / Answer

ANS 1

( the room temperature solution is more soluble by the given data)

ANS 2

ln Ksp2/Ksp1 = (delta H /R) * (1/)

ln (0.0011/0.008) = delta H / R (1/292 - 1/278)

= -1.975 = delta H * (-1.7246*10^-4)/8.314

= 95.208 KJ/mol = delta H

ANS 3

The reaction is endothermic as the delta H of the reaction is positive which accounts for endothermic reactions

ANS 4

The results are consistent with the Le Chateliers principle

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