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Ch.13 - Properties of Solutions
Brown - Chemistry: The Central Science 15th Edition
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoBrown 15th EditionCh.13 - Properties of SolutionsProblema 7
Capitolo 13, Problema 7

The structures of vitamins E and B6 are shown below. Predict which is more water soluble and which is more fat soluble. [Section 13.3]

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Identify the key structural features of vitamins E and B6 that influence their solubility, focusing on the presence of polar (hydrophilic) groups and nonpolar (hydrophobic) regions.
Recall that water solubility is generally associated with molecules containing polar functional groups such as hydroxyl (-OH), amino (-NH2), or phosphate groups, which can form hydrogen bonds with water.
Recognize that fat solubility is favored by large nonpolar hydrocarbon chains or rings, which interact well with lipid environments but poorly with water.
Examine vitamin E's structure for long hydrocarbon chains or aromatic rings that contribute to its nonpolar character, making it more fat soluble.
Examine vitamin B6's structure for multiple polar groups (such as hydroxyl and amino groups) that increase its ability to interact with water, making it more water soluble.

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Solubility and Polarity

Solubility depends on the polarity of molecules; polar molecules dissolve well in water (a polar solvent), while nonpolar molecules dissolve better in fats or oils (nonpolar solvents). Understanding the presence of polar groups like hydroxyl or amine groups helps predict solubility.
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Molecular Polarity

Structure and Functional Groups of Vitamins

The chemical structure and functional groups of vitamins determine their polarity. Vitamin B6 contains polar groups such as hydroxyl and amine groups, making it more water soluble, whereas vitamin E has a long nonpolar hydrocarbon chain, increasing its fat solubility.
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Functional Groups Example

Hydrophobic vs. Hydrophilic Interactions

Hydrophobic molecules repel water and tend to dissolve in lipids, while hydrophilic molecules attract water and dissolve in aqueous environments. Recognizing these interactions helps explain why some vitamins are fat soluble (like vitamin E) and others are water soluble (like vitamin B6).
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Ksp vs Q in Precipitation
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Domanda del libro di testo

This portion of a phase diagram shows the vapor–pressure curves of a volatile solvent and of a solution of that solvent containing a nonvolatile solute. (b) What are the normal boiling points of the solvent and the solution? [Section 13.5]

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Domanda del libro di testo

The figure shows two identical volumetric flasks containing the same solution at two temperatures. (b) Does the molality of the solution change with the change in temperature? [Section 13.4]

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Domanda del libro di testo

Consider two ionic solids, both composed of singly charged ions, that have different lattice energies. (a) Will the solids have the same solubility in water? (b) If not, which solid will be more soluble in water, the one with the larger lattice energy or the one with the smaller lattice energy? Assume that solute–solvent interactions are the same for both solids. [Section 13.1]

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