Question

1.A student is presented with a heterogeneous mixture of two solids(A& B). Using the table provided below, determine which of the followingsolvents (X,Y, or Z) would be an appropriated choice for isolatingand recrystallizing Unknown A from Unknown B? Explain the reasoningbehind your decisionin detail. In addition, explain why each of the remaining twosolvents would not be acceptable options for the proposedexperiment.

	SolventX		SolventY		SolventZ
	HighTemperature	RoomTemperature	High Temp	Room Temp	High Temp	Room Temp
Solubilityof Unknown A (g/100mL)	4.33	4.20	3.23	0.60	5.25	0.18
Solubilityof Unknown B (g/100mL)	0.72	0.51	2.14	0.34	0.003	0.001

2.After recrystallizing an unknown solid, youobtain a preliminary melting point range of 134-139degreescentigrade. Identify your purified unknownusing the table below. Which of these compounds is your unknownmost likely to be? How did you arrive at your decision? Explainyour reasoning in detail?

CompoundName	MeltingPoint
BenzoicAcid	121-123
Benzamide	128-130
CinamicAcid	133-135
o-NitrobenzoicAcid	146-148
SalicylicAcid	158-160

3.CompoundH is soluble in ethanol at 78.4 degrees centigrade(2.3g/100mL). Ifyou were given an 800mg sample of Compound H, what specific volumeof solvent would you require to perform a suitablerecrystallization? Show your calculations and explain yourreasoning?

4.Afterobtaining a preliminary melting point range of 124-130 degreescentigrade for an unknowns, you identify it as benzamide. Running a mixedmelting point determination with benzamide affords a melting pointrange 117-125 degrees centigrade. What does this tell you aboutyour initial assumptionconcerning the identity of your unknown solid? Why did your meltingpoint change so dramatically ?