What Makes Substances Insoluble? Understanding Chemical Interactions

Discover why some substances remain insoluble due to molecular attraction and factors like temperature and pH.

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Insolubility typically occurs due to the chemical nature of substances involved. If the attraction between the molecules of the solute is stronger than the attraction between the solute and solvent molecules, the solute will remain insoluble. Factors like temperature and pH can also affect solubility, but the primary consideration is molecular interaction.

FAQs & Answers

  1. What determines whether a substance is soluble or insoluble? The solubility of a substance is determined by the strength of attraction between its molecules compared to the attraction between the solute and solvent molecules. If the solute's molecular attraction is stronger, it will remain insoluble.
  2. Can temperature affect the solubility of a substance? Yes, temperature can affect solubility. Typically, increasing the temperature can increase the solubility of solids in liquids, while gases may become less soluble at higher temperatures.
  3. What role does pH play in the solubility of substances? pH can significantly influence solubility, especially for ionic compounds. Changes in pH can alter the charge of solute molecules, thus affecting their ability to dissolve in solvent.
  4. Are all substances soluble in water? No, not all substances are soluble in water. Substances like oils and certain minerals are insoluble due to differences in molecular interactions and polarity.

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