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Question

Based on solute-solvent interactions, arrange the following in order of increasing solubility in n-octane and explain.
Cyclohexane, KCl, CH3OH, CH3CN

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Solution

n-Octane is non polar and can dissolve non-polar solutes. It cannot dissolve polar (and ionic) solutes.

Cyclohexane is non-polar. Hence, easily soluble in n-octane.

Methanol and acetonitrile are polar and have very low solubility in n-octane.

KCl is ionic compound and hence, insoluble in n-octane.

The increasing order for solubility in n-octane is as follows:

KCl<CH3OH<CH3CN<Cyclohexane

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