๐Ÿงช Explanation of Fig. 2.1 – Effect of Pressure on Gas Solubilit

 Sure, Mayank! Here's a clear and simple explanation of the activity shown in Fig. 2.1 from NCERT Class 12 Chemistry (Chapter: Solutions), which explains the effect of pressure on the solubility of gases in liquids.

๐Ÿงช Explanation of Fig. 2.1 – Effect of Pressure on Gas Solubility

๐Ÿ“˜ What Fig. 2.1 Shows:

It includes two diagrams – labeled as:

(a) Before Increasing Pressure

  • There is a liquid solvent in the bottom part of a closed container.

  • Above the liquid, there is a gas at pressure p and temperature T.

  • Some gas particles are dissolving into the liquid, and some are leaving the liquid.

  • The system is at dynamic equilibrium:

    Rate of gas entering the liquid = Rate of gas escaping from the liquid

(b) After Increasing Pressure

  • Now, the gas above the liquid is compressed (volume is decreased).

  • This increases the pressure on the surface of the liquid.

  • As a result:

    • More gas particles are forced into the liquid

    • More frequent collisions of gas molecules with the liquid surface

    • More gas molecules get dissolved

  • A new equilibrium is established with higher solubility of gas in the liquid.

๐Ÿ“Œ Conclusion from the Activity (Fig. 2.1):

When pressure is increased, the solubility of the gas in the liquid increases because more gas particles are forced into the liquid phase.

๐Ÿ” Real-Life Example:

  • Soft drink bottles are sealed under high pressure to keep CO₂ gas dissolved in the liquid.

  • When opened (pressure drops), gas escapes as bubbles.

๐Ÿ“ Key Exam Points:

  • This figure demonstrates Henry’s Law in action.

  • Dynamic equilibrium shifts to dissolution side when pressure is increased.

  • Use this activity to visually support answers related to gas solubility and Henry’s Law.

Would you like me to redraw Fig. 2.1 in a simple way for a slide or make an animated explanation for your presentation?

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