⚖️ What is Henry’s Law Constant (KH)?

 

⚖️ What is Henry’s Law Constant (KH)?

📚 CBSE Class 12 | Easy & Exam-Focused

✅ Definition:

Henry’s Law Constant (KH) is a proportionality constant in Henry’s Law that relates the partial pressure of a gas to its mole fraction (solubility) in a liquid at a fixed temperature.

🧪 Henry’s Law Equation:

p=KH⋅xp = K_H \cdot x

Where:

  • p = partial pressure of the gas above the solution

  • x = mole fraction (solubility) of the gas in the liquid

  • KH = Henry’s Law Constant

📌 Key Points About KH:

  • It depends on the nature of the gas and the temperature.

  • Units: Usually in kbar or atm.

  • Higher KH ⇒ lower solubility of gas at a given pressure.

  • KH increases with temperature, meaning solubility decreases with rising temperature.

🧠 Example:

Gas Temp (K) KH (kbar) Solubility
CO₂ 298 1.67 High
O₂ 293 34.86 Moderate
He 293 144.97 Very low

📝 CBSE Exam Tip:

  • Clearly write the formula:

    p=KH⋅xp = K_H \cdot x

  • Always explain:

    "Higher the KH, lower the solubility of gas in the liquid."

Would you like a visual chart showing gases with their KH values for your classroom or slides?

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