Sand can be heated to very high temperatures without having to be replaced due to evaporation. Sand is a common solid used in heating baths. Remember to replace the liquid as it evaporates. Liquids should not be flammable or present any other hazards. Likewise, other liquids could be chosen to control the amount of heating. If a sample is not to be heated above 100☌, then water can be used in the bath (since liquid water can not be heated above its boiling point). Selection of the liquid or solid can help to control the temperature of the bath. The bath is heated and the sample is placed in the bath. The bath is assembled by placing a liquid or solid in a large beaker (or a container that looks like a beaker). To indirectly heat a container, set up a bath on the hot plate. When the container does not have a flat surface or more control over the temperature is required, indirect heating should be used. Even low temperature settings on the hot plate may reach temperatures in excess of 100☌ and the temperature of the plate will flucuate due to air currents or room temperature changes. Controlling the temperature of the solution is more difficult when using direct heating. Weighted holder grips beakers or flasks firmly with four flared stainless steel prongs.Flask weights are used primarily to stabilize glassware in a water. Other containers that do not have a flat surface should be heated indirectly. These containers have a flat bottom and heat will be spread evenly throughout the solution when the solution is also stirred. Always use the lowest temperature setting possible when heating.īeakers and Erlenmeyer flasks can be heated directly on a hot plate. Flasks or beakers containing solutions can be heated directly or indirectly depending upon the shape of the container and the desired temperature. A hot plate is used to heat objects or containers.
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