What Makes Substances Insoluble in Water? Understanding Solubility Basics
Discover why certain substances are insoluble in water and how molecular polarity affects solubility. Learn the 'like dissolves like' principle.
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Solubility in water is determined by the ability of a substance to form hydrogen bonds with water molecules. Substances that are insoluble generally have nonpolar molecules which cannot form hydrogen bonds with water, making them repel rather than mix. This includes oils, fats, and many organic compounds. The rule of thumb is 'like dissolves like'; hence, nonpolar substances do not dissolve in a polar solvent like water.
FAQs & Answers
- Why are nonpolar substances insoluble in water? Nonpolar substances cannot form hydrogen bonds with water molecules, which are polar. Because of this lack of interaction, nonpolar molecules repel water and do not dissolve, following the 'like dissolves like' principle.
- What types of substances are typically insoluble in water? Oils, fats, and many organic compounds with nonpolar molecules are typically insoluble in water because they cannot form hydrogen bonds with water molecules.
- How does hydrogen bonding affect solubility in water? Hydrogen bonding allows polar substances to interact and mix with water. Substances that can form hydrogen bonds dissolve well in water, while those that cannot remain insoluble.