Question

Which law relates solubility of solvents with pressure?

• A. Hess’ law
• B. Henry’s law
• C. Charles’ Law
• D. Boyle’s law

Hint:

Henry's law is fundamental in understanding how gases dissolve in liquids under pressure, such as in soda cans.

Answer 1

The Correct Option is B

Step 1: Concept.
Hess' law is about reaction enthalpy paths, and Charles' and Boyle's laws relate a gas's own volume, pressure, and temperature without any liquid involved.

Step 2: Match to the question.
Only Henry's law specifically links how much gas dissolves in a liquid to the pressure of that gas above it.

Step 3: Final Answer.
The law that relates solubility of gases with pressure is Henry's law.

Answer 2

Recalling one real situation where each law is actually used tells the four apart quickly.

1. Hess' law: This is used to calculate the enthalpy of a reaction that is hard to carry out directly, by adding up the enthalpies of a series of steps that lead to the same overall reaction. There is no gas solubility involved anywhere in this use.
2. Henry's law: This is the law used to explain why a sealed soda bottle holds so much dissolved carbon dioxide under pressure, and why that gas bubbles out once the pressure is released. This directly involves the solubility of a gas in a liquid changing with pressure.
3. Charles' Law: This is used to explain why a balloon left in a hot car expands, since gas volume grows with temperature at constant pressure. No liquid or dissolving is involved.
4. Boyle's law: This is used to explain why a gas-filled syringe gets harder to push as its volume shrinks and its pressure rises at constant temperature. Again, this is about a gas alone, not one dissolving into a liquid.

Of these four everyday uses, only the soda-bottle example involves a gas dissolving in a liquid under pressure, which is exactly what Henry's law describes.

So the correct answer is Henry's law.