What Determines If a Substance Is Soluble or Insoluble?

Explore the key factors that affect solubility, including molecular interactions, temperature, and pH, to understand why some substances dissolve while others don’t.

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The solubility of a substance depends on molecular interactions between the solvent and solute. Soluble substances easily dissolve due to favorable interactions, such as ionic or strong hydrogen bonds, with the solvent. Insoluble substances have weak interactions with the solvent or form stable internal structures that are hard to break apart, making them unable to dissolve. Factors like temperature and pH can also influence solubility, making certain substances more soluble or insoluble under different conditions.

FAQs & Answers

  1. What makes a substance soluble in water? A substance is soluble in water when it can form favorable molecular interactions such as ionic bonds or hydrogen bonds with water molecules, allowing it to dissolve easily.
  2. Why are some substances insoluble in certain solvents? Substances are insoluble when they have weak interactions with the solvent or form strong internal bonds that are difficult to break, preventing them from dissolving.
  3. How do temperature and pH affect solubility? Temperature and pH can alter the strength of molecular interactions and the stability of solutes, making some substances more or less soluble under different conditions.

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