like dissolve like
Sure! Here's a simple, impactful explanation of "Like Dissolves Like" — perfect for Class 12 CBSE students in class or presentation.
🧪 “Like Dissolves Like” – Explained Simply
✅ Meaning:
A solute dissolves best in a solvent that has similar polarity or similar type of intermolecular forces.
In simple words:
Polar substances dissolve in polar solvents
Non-polar substances dissolve in non-polar solvents
📌 That’s why we say: “Like dissolves like.”
💡 What is Polarity?
-
Polar molecules have a positive and negative end (due to unequal sharing of electrons).
👉 Example: Water (H₂O) -
Non-polar molecules have no such charge separation.
👉 Example: Benzene (C₆H₆), oil
🔍 Examples:
Solute | Solvent | Result | Explanation |
---|---|---|---|
Salt (NaCl) | Water | ✅ Dissolves | Both are polar |
Sugar | Water | ✅ Dissolves | Both are polar |
Naphthalene | Benzene | ✅ Dissolves | Both are non-polar |
Oil | Water | ❌ Does not dissolve | Oil = non-polar, Water = polar |
🧠 Why It Happens:
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When solute and solvent have similar forces, they can mix easily.
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If their forces are different (e.g., strong H-bond in water, weak dispersion in oil), they don’t mix.
📌 CBSE Tip:
Use this principle to predict solubility in MCQs and theory questions.
Always give examples like NaCl in water and naphthalene in benzene.
Would you like a diagram or slide design to explain this visually in class?
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