What is the purpose of mineral wool in lab setups?

• A. Absorb and hold the liquid.
• B. Color-code reagents.
• C. Act as a catalyst.
• D. Insulate heat loss.

Answer: (A)

Insulating heating setups to reduce heat loss. Mineral wool is a fibrous, heat-resistant material that traps air and resists heat transfer. When you place it around or under hot glassware, it slows down the loss of heat to the surroundings. This keeps the liquid hotter for longer, helps you reach and maintain the intended temperature more quickly, and makes measurements more reliable because temperature changes due to heat loss are minimized. It isn’t used to absorb liquids, act as a catalyst, or color-code reagents, which is why insulation is the appropriate role for mineral wool.