Why a non-volatile solute lowers vapour pressureअवाष्पशील विलेय वाष्प दाब क्यों घटाता हैWhy a non-volatile solute lowers vapour pressure

NCERT Fig 1.4 · Class 12 Chemistry · Chapter 1 · interactive diagram

Parts and what they mean

• Solvent molecules (विलायक अणु) — Only these can escape into the vapour.
• Non-volatile solute particles (अवाष्पशील विलेय कण) — They take up part of the surface, so fewer solvent molecules are at the surface to escape.
• Escaping vapour (निकलती वाष्प) — Fewer molecules escape from (b) → vapour pressure of the solution is LOWER than the pure solvent’s.
• Liquid (द्रव) — Same temperature in (a) and (b).

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 1.4. Report a mistake