मराठी
Tamil Nadu Board of Secondary EducationHSC Science Class 11

Ideal and Non-ideal Solutions

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Estimated time: 6 minutes
CBSE: Class 12

Key Points: Ideal and Non-ideal solution:

For ideal solution: ΔHmix = 0, ΔVmix = 0

For non-ideal solution: ΔHmix ≠ 0, ΔVmix ≠ 0 

  • Positive deviation: A-B interaction < A-A or B-B interactions 
  • Negative deviation: A-B interaction > A-A or B-B interactions

Plots for Ideal and Non-Ideal Solutions: Formation of ideal solutions can also be represented graphically.

Formation of non-ideal solutions with negative deviation can be represented as:

Azeotropic Mixtures:

A type of liquid mixture having a definite composition and boiling like a pure liquid (i.e., constant boiling mixture).

Type Deviation Example Boiling Point
Minimum Boiling Azeotrope Positive deviation 95.37% (w/w) ethanol + water Less than either component
Maximum Boiling Azeotrope Negative deviation 68% (w/w) HNO₃; 20.3% HCl More than either component

Shaalaa.com | Solutions part 20 (Non ideal solution: Positive and negative deviations)

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Solutions part 20 (Non ideal solution: Positive and negative deviations) [00:09:50]
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