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8. Heating with a Casserole
General Remarks
- Casseroles are employed in "Inorganic Qualitative Analysis Experiment".
- Put your safety glasses on and never bring your face close to a heated casserole because the boiling liquid might spray.
- Keep the liquid level below the half of the casserole depth.
- Because the rubber handle may get burned, never heat it on wire gauze with ceramic center.
- Because a casserole might be broken upon heating when it has water drops on the outside. Wipe them off before use.
- The bench might get burned when a casserole is put on immediately after heating. A hot casserole might crack when put on a wet place. Put it on a heat-resistant board or on a dry bench after short cooling.
- Add a liquid after sufficient cooling to dissolve the residue. Otherwise, the casserole might deform or crack.
How to Use a Casserole
- Gently heat a casserole containing a solution with a small flame and slowly move the casserole in a consistent circular motion over a flame.
- When the liquid begins to boil, move the casserole away from the flame. Then, keep gentle boiling by occasional heating.
- When a part of the bottom of the casserole begins to dry, move the casserole away from the flame and let the solution completely dry by residual heat.
8. Heating Using a Tripod and Wire Gauze with Ceramic Center
General Remarks
- Keep the liquid level below the half of the container depth.
- Wipe water drops off on the outside of the container before heating.
How to Heat a Liquid in Glassware
- After ignition and adjustment of the flame, move a tripod and wire gauze with ceramic center to the burner. Then, put the container on the gauze.
- For long time heating, cover the container with a watch glass to prevent the liquid from drying. Put a watch glass with the convex side down.
