effect of temperature on solubility of gases

 Here is a simple, CBSE Class 12–friendly explanation of the Effect of Temperature on the Solubility of Gases in Liquids, based on the paragraph you provided:

🌡️ Effect of Temperature on Gas Solubility

📖 Key Concept:

The solubility of gases in liquids decreases with an increase in temperature.

🧪 Why Does This Happen?

  • When a gas dissolves in a liquid, the gas molecules move from the gaseous phase to the liquid phase.

  • This is similar to condensation, which is an exothermic process (releases heat).

  • According to Le Chatelier’s Principle:

    If a system at equilibrium is disturbed, the system shifts in the direction that opposes the disturbance.

➡️ So, if temperature increases, the system tries to remove heat by shifting the equilibrium backward (i.e., gas leaves the solution).
✅ Result: Solubility of the gas decreases.

🔄 Dynamic Equilibrium Involved:

Gas (above solution)⇌Gas (dissolved in liquid)+Heat\text{Gas (above solution)} \rightleftharpoons \text{Gas (dissolved in liquid)} + \text{Heat}

➡️ Increase in temperature shifts equilibrium to the left → less gas dissolves.

🧠 Real-Life Example:

  • In cold water, more oxygen is dissolved → better for aquatic life.

  • In warm water, less oxygen is available → fish may suffer from low oxygen levels.

📌 Summary:

Factor Effect on Gas Solubility
↑ Temperature ↓ Solubility of gas
↓ Temperature ↑ Solubility of gas

📝 Exam Tip (CBSE):

  • Always mention:

    • Exothermic nature of gas dissolution

    • Le Chatelier’s Principle

    • Use keywords like “equilibrium shifts backward” and “solubility decreases”

Would you like a concept diagram, a summary slide, or a student activity to demonstrate this in class?

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