Question

Please answer all!

1. a. Calculate the moles of Calcium hydroxide in a solution if 32.4 mL of saturated calcium hydroxide solution is titrated with 0.0500M HCl. 14.90mL of HCl was needed to completely react with the calcium hydroxide. (5pts)

2. a.) Calculate the free energy in a saturated solution of Ca(OH)2 if the Ksp = 6.5x10-6 at 25?C. Show all work. (5pts) b.) Is the reaction spontaneous or nonspontaneous? Briefly explain your answer. (5pts)

3. What is the symbol for the standard change in entropy? (2pts)

4. Calculate the (a) free energy and (b) entropy if the enthalpy of dissolution of calcium hydroxide is - 16.86kJ/mol.The Ksp = 6.5x10-6 at 25?C. Show all work. (15pts) a. free energy (5pts) b. entropy (5pts) c. Is the reaction exothermic or endothermic? Briefly explain your answer. (5pts)

5. What is the symbol for the standard free energy change? (2pts)

6. What is the symbol for the standard enthalpy change? (2pts)

7. a.) Calculate the concentration of Ca2+ in a saturated solution of Ca(OH)2 if the Ksp = 6.5x10-6 at 25?C. (5pts) b.) Calculate the Ksp at 40?C if the concentration of Ca2+ is 0.0080M. Show all work for partial credit. (5pts) c.) Does the solubility of Ca2+ increase or decrease at higher temperature? Why did you answer this way. (5pts)

Answer 1

cac 20 Ca co aL mst Imde from Reatton Imde Cacou)2 reactng wir .mil x Vdlume in Litrg Molaily No. 4 m Hcl = = 7.45x 0 Imde CacoH X 2 m rracb airh 2 3-725 x10 mds = 6 5x104 T = 4G--RT In kip 3 K298 x l94u) -8. 314 K1O = 29.59 ko/wmt eney chang a4 - a9-6 kmde AG ispesitue The reautn Non Spontanuous faspontaneous reaubon As 0 A negetve