Crucible vs. Evaporating Dish: Key Lab Uses, Differences, and How to Choose
A crucible is a small, heat-resistant cup used for melting or ashing substances at very high temperatures; an evaporating dish is a wide, shallow porcelain dish designed for gently concentrating liquids by evaporation under moderate heat.
Students grab the first ceramic dish they see, but the crucible’s thick walls and lid lock in fumes and withstand the roaring Bunsen flame, while the evaporating dish’s broad surface invites slow, open-air drying—easy to confuse until your sample either vaporizes in seconds or sits stubbornly wet.
Key Differences
Crucibles endure 1000 °C+, often with a lid to contain gases; evaporating dishes top out around 500 °C, lid-free, and maximize surface area for liquid loss.
Which One Should You Choose?
Need to fuse metals or ash a sample? Reach for the crucible. Simply want to drive off solvent and leave solid residue? Pick the evaporating dish.
Examples and Daily Life
Chemists melt copper alloys in crucibles; high-schoolers watch salt crystals appear as water vanishes from an evaporating dish on a hot plate.
Can I heat a crucible on a kitchen stove?
Stoves rarely exceed 300 °C, so while safe, the crucible won’t reach its potential and your food will taste odd.
Is an evaporating dish microwave-safe?
Yes, if it’s borosilicate or porcelain, but heat in short bursts to avoid thermal shock.