What is the Difference Between Crucible and Evaporating Dish?
🆚 Go to Comparative Table 🆚The main difference between a crucible and an evaporating dish lies in their uses and the materials they are made of:
- Crucible:
- Used for heating non-aqueous substances, such as melting non-corrosive salts, burning precipitation, and carbonizing or ashing complex samples.
- Made of materials resistant to high temperatures, such as ceramic (with an upper temperature limit of about 800 degrees) or quartz (which can withstand temperatures above 1000 degrees).
- Can be heated directly or placed in a high-temperature heating furnace.
- Often used in conjunction with crucible tongs for handling.
- Evaporating Dish:
- Used for the evaporation of solutions and supernatant liquids.
- Typically made of ordinary glass, porcelain, or borosilicate glass, with a use temperature below 400 degrees.
- Can be heated directly with an open flame (for ceramic evaporating dishes) or covered with an asbestos net for heating (for glass evaporating dishes).
- Generally held by hand, with glass rods or spoons used to transfer reagents.
In summary, a crucible is designed for heating non-aqueous substances and is made of materials resistant to high temperatures, while an evaporating dish is used for evaporating solutions and is typically made of glass or porcelain, with a lower temperature tolerance.
Comparative Table: Crucible vs Evaporating Dish
Here is a table comparing the differences between a crucible and an evaporating dish:
Feature | Crucible | Evaporating Dish |
---|---|---|
Purpose | Used for melting metals or subjecting substances to high temperatures | Used for evaporating solutions and supernatant |
Material | Resistant to high temperatures, often made of ceramic or quartz | Usually made of ordinary glass or ceramic, use temperature should be below 400 degrees |
Heating Method | Can be heated directly or placed in a high-temperature heating furnace | Generally heated by covering with asbestos mesh, or directly heated by an open flame |
Use with Tongs | Commonly used with crucible tongs for handling | Not typically used with tongs, can be held by hand |
Keep in mind that while both crucibles and evaporating dishes are laboratory glassware, they have different uses and material requirements. A crucible is designed for heating non-aqueous substances and can withstand high temperatures, while an evaporating dish is mainly used for evaporating solutions.
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