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Melting and Boiling Point.docx

Melting and Boiling Point.docx - Melting and Boiling Point...

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Melting and Boiling Point Objective: The goal of this experiment is to measure the melting and boiling point of compounds and to determine the purity of compounds. Pre-Lab questions: Pre-Lab questions were revised and hand in. Introduction: The melting point is defined as the temperature at which solid and liquid states coexist. If the solid is pure, it has a sharp melting point. Impurities will lower than melting points relative to accepted value and increase the melting point range. Usually, the melting point range of pure substance between the final droplet and the first droplet is less than 4 . The boiling point is defined as the temperature at which liquid and gas states coexist. The impurities will raise the boiling point relative to accepted value. The melting point and boiling point are usually used ti figure out whether a compound is pure or not. List of equipment: Capillary tubes; Temperature probes; Hot plate; Digital interface; melting point apparatus; Ring stand; Test tube; Breaker; Water; Clamp(utility); Boiling chips; Ethanol; P-dichlorobenzene; Acetone; Ethanol; Weighting papers; Two-hole corks; Spatula; Hallow glass tube.
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Procedure and observations: Part A. Melting Point Determination A tiny size of p-dichlorobenzene was presented on a piece of paper. The crystals were
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