Just an ideal solution will theoretically exhibit Hsolution = 0, optimum miscibi

Question

Just an ideal solution will theoretically exhibit Hsolution = 0, optimum miscibility will occur when the attractive forces (intermolecular forces for molecular substances, lattice energy for ionic substances) of solute and solvent and solution are as alike as possible. In other words, liquid methanol, CH3OH, which exhibits dispersion and dipole-dipole/H-bonding attractive forces, is very miscible with liquid water, which also exhibits dispersion and dipole-dipole/H-bonding attractive forces, because the resultant forces between the methanol and water are likewise dispersion and dipole-dipole/H-bonding attractive forces. “Like dissolves like” is the commonly-heard rule.

Which of the following substances would be predicted to be the most soluble in hexane (C6H14) ?

A. diethyl ether, CH3CH2OCH2CH3

B. methanol, CH3OH

C.  benzene, C6H6

D.  methylene chloride, CH2Cl2

I put D and it was wrong.

Which of the following substances would be predicted to be the most soluble in hexane (C6H14) ?

A. diethyl ether, CH3CH2OCH2CH3

B. methanol, CH3OH

C.  benzene, C6H6

D.  methylene chloride, CH2Cl2

I put D and it was wrong.

Explanation / Answer

ANSWER: C

Hexane is soluble in benzene because hexane is non polar and benzene is non polar. non polar solvents soluble in non polar solvents.

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