⚖️ What is Henry’s Law?

 Here is a simple, CBSE Class 12–friendly definition and explanation of Henry's Law (often referred to as Henry's Rule by students):

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⚖️ What is Henry’s Law?

📚 CBSE Board Exam Friendly | Class 12 Chemistry

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📖 Definition (As per NCERT):

Henry’s Law states that:
At constant temperature, the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid.

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🧪 Mathematical Form:

$$p = K_H \cdot x$$

Where:

• p = partial pressure of the gas above the solution

• x = mole fraction of the gas in the solution

• KH = Henry’s law constant (depends on gas & temperature)

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🧠 Explanation in Simple Words:

• If we increase the pressure of a gas over a liquid → more gas will dissolve in the liquid.

• If we reduce the pressure → less gas dissolves.

• So, higher pressure = higher gas solubility.

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📌 Important Points:

• Henry’s constant KH is different for each gas.

• Higher KH ⇒ Lower solubility

• Henry’s Law explains the behavior of gases in soda, blood, and scuba diving.

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🧃 Real-Life Examples:

1. Soft Drinks: CO₂ is sealed under high pressure → stays dissolved

2. Scuba Diving: More N₂ dissolves in blood under pressure

3. High Altitudes: Low O₂ pressure → less O₂ dissolves → anoxia

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✅ CBSE Exam Tip:

• Learn the definition + formula

• Write at least one application

• Use terms like "partial pressure" and "mole fraction"

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