2. List criteria that you think were used for the selection of lauric acid as th

Question

2. List criteria that you think were used for the selection of lauric acid as the solvent for the experiment which included using cooling curves to DETERMINE MELTING POINTS. (Basically, why is lauric acid a good solvent for determing melting point in the lab?)

Solvent information: Kf for lauric acid is 4.40 degrees celsius kg/mol

Then for number 3, it asks why we tink those acids were eliminated from being used as solvents in the lab for determining melting points. Plase also help with number 4! Thank you!

or aceti acid, bencens. campliot, sum erimees 234 clonide and waier as 3.9, 5.12. 3.7, 107 and 186 'Cm respectively. Why do you thisk eac of the above solvents was elininated from coasideration for this exp Lange's Haook of Chenisty lists k, valoes for acetie acid lists k v 3. ocetie acid benzene stronciurn chloride 4 Considering the ocher methods you have suchastitration and qusetitative precipitation, when would the melting point depression method be used? Explain in detail. the ocher methods you have used that could be used to determine molecular mass

Explanation / Answer

Answer.

Lauric acid is used in cryoscopy for molar mass determination. It is a good solvent because it has relatively high cryoscopic constant (it makes the determination to be more precise) and it also has a moderate melting point (43.8 °C)

Acetic acid in a pure form is extremely hygroscopic, at absorbs water vapour from air changing its own melting point.

Benzene is highly toxic and volatile substance.

Camphor has too high melting point 176 °C.

Strontium chloride has even higher melting point 874 °C. - Most of organic substances will decompose at this temperature.

Water has a low cryoscopic constant, therefore, the molar mass measurment will not be so precise.

Although the melting point method is quick and easy, it can be applied to the pure samples only. The sample should also have a supposed identity.

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