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Chapter 13: Q13.5 P (page 546)

Hexane and methanol are miscible as gases but only slightly soluble in each other as liquids. Explain.

Short Answer

Expert verified

Hexane and methanol are immiscible with each other in a liquid state because methanol is a polar molecule and hexane is a non-polar molecule.

Step by step solution

01

Solubility as gases

All gases are miscible to each other. There are no intermolecular forces as such between hexane and methanol in a gaseous state. Gases would mix with each other to occupy the entire space.

02

Solubility as liquids

Solubility of any substance depends on the following condition: like dissolves like means polar substances can dissolve in a polar solvent and vice versa. Here, hexane is a non-polar molecule and methanol is a polar molecule having a polar –OH group. So, both these molecules cannot interact with each other because dipole interactions already present between the methanol molecules won’t allow them to mix with a non-polar molecule.

Hence methanol and hexane are immiscible as liquids because of their difference in polarity.

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