Need some help with a lab asap please. Its a freezing point lab. 3 parts. I don\

Question

Need some help with a lab asap please.
Its a freezing point lab. 3 parts. I don't need help with calculations, just the formulas and setups. Thank you!
Part 1: I have the mass of pure naphthalene, time and temperature at which crystals first appeared, and maximum temp after crystals appeared. Need to find freezing point of the pure naphthalene.

Part 2: I have a mix of biphenyl and naphthalene, and the mass of each. I have the time and temp at which crystals first appeared, max temp after crystals appeared. I need to find the freezing point of the solution, freezing point depression, molality of the solution, and the Kf of naphthalene

Part 3: I have a mixture of an unknown compound and naphthalene and their masses, the time and temp at which crystals first appeared, max temp after crystals appeared. I need to find the freezing point of the solution, the molality of the solution, the experimental molar mass of the unknown.

Thank you!

Explanation / Answer

1) Freezing point = crystallizaiton point

2) we know that

Depression in freezing point = molality X kf

So if you have the point at which first crystal appear, so that will be melting point of the compound

3) molality = mass of solute / molecular weight of solute X mass of solvent

Related Questions

Navigate

• Browse (All)
• Browse N
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.