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What is the purpose of heating the porcelain crucible?

Answer

to increase the inter mlecular space of the solvent so the solute particles get in the increased space.
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it is smooth and durable. will not grind away and contaminate what you are crushing. material is inert and will not react to what you are grinding/mixing. metals will react with chemicals
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The crucible will probably
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A crucible needs to be a material that can stand a very high heat and not react with the material in it. It can not melt or vaporize or combine with the test material or cause the
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