Final answer:
The formation of slaked lime produces a hissing sound and bubbles due to the exothermic chemical reaction between calcium oxide and water, which releases energy as heat and sound. Similar to the hissing heard when opening a carbonated beverage, it is the rapid transition from a solid or pressurized state to a released state that causes these auditory and visual cues.
Step-by-step explanation:
The formation of slaked lime is accompanied by a hissing sound and the formation of bubbles due to a chemical reaction between calcium oxide (lime) and water. This exothermic reaction releases energy in the form of heat and produces calcium hydroxide, also known as slaked lime. During this process, water molecules penetrate the calcium oxide structure, leading to the breaking of chemical bonds, the formation of new bonds in calcium hydroxide, and the release of heat and sound.
The hissing sound similar to the opening of a carbonated beverage container is due to the rapid release of energy and the transition from solid lime to an aqueous form—slaked lime. When the dissolution equilibrium of carbon dioxide in a carbonated beverage is disrupted by the release of pressure, the concentration of dissolved CO₂ decreases, and carbon dioxide escapes as bubbles, creating a hissing sound. Similarly, in the case of slaked lime formation, the reaction between solids (lime) and liquid (water) rapidly evolves heat and gas, creating a hissing noise.
Moreover, the bubbles signify the release of energy as the solid structure of calcium oxide breaks down to form a more energetically favored hydroxide in solution. This chemical reaction is also an observation tool in experiments, such as when limewater turns milky upon the addition of carbon dioxide, indicating the presence of this gas.