​Why does lime water turn milky when we blow in it through a straw?​

Correct option is A

The correct answer is Due to carbon dioxide.

• Carbon dioxide (CO₂):
  ○ When you blow into lime water (a solution of calcium hydroxide, Ca(OH)₂), you are introducing carbon dioxide from your breath into the solution.
  ○ The carbon dioxide reacts with the calcium hydroxide to form calcium carbonate (CaCO₃), which is insoluble and appears as a milky precipitate.
  ○ The chemical reaction can be represented as follows:
  ▪️ Ca(OH)₂ + CO₂ → CaCO₃ + H₂O
  ○ This is a classic demonstration of a chemical reaction between an acid (CO₂) and a base (Ca(OH)₂), resulting in a salt (CaCO₃) and water (H₂O).

Additional Information

• Waste particles:
  ○ Breathing into lime water does not introduce solid waste particles that would cause it to turn milky. The primary substance affecting the solution is carbon dioxide.
• Moisture:
  ○ While breath does contain moisture, it does not interact with lime water in a way that would cause it to turn milky. The milky appearance is specifically due to the formation of calcium carbonate.