13 容量和定性分析.pptx

Part1 Introductory Chemistry Speciality English Lesson 13 Volumctric Analysis and Qualitative Analysis 容量分析与定性分析 Hands-On Chemistry: What is the Volume of Your Lungs？ [Reading Material] Electroanalytical Methods of Analysis;掌握：1. 容量分析法涵义。2. 摩尔浓度和当量浓度。3. 未知浓度溶液的当量浓度计算。 熟悉：有机定性分析。 了解：电化学分析方法。;Chemical analyses [??n?laiz] can be made by determining how much of a solution of known concentration is needed to react fully with an unknown test sample. The method is generally referred to as volumetric analysis and consists of titrating the unknown solution with the one of known concentration ( a standard solution ). [v?lju?metrik] adj. 测定体积的、titrating [?taitreit??] v. 用滴定法测量( titrate的现在分词 )、 [?st?nd?d] n. 标准、规格、度量衡标准、adj. 标准的、合格的、普遍的、 公认为优秀的 化学分析可以通过确定已知浓度的溶液中需要多少来与未知的测试样品充分反应来进行。该方法一般称为体积分析法，包括用已知浓度(标准溶液)滴定未知溶液。;By titration [tai?trei??n], you can determine exactly how much of a reagent is required to bring about complete reaction of the test solution. Usually, completion of the reaction is indicated by a sudden, visible change in the reaction system that coincides with the stoichiometric relationship between moles or equivalents of the reagent solution and the reactant in the test solution. [ri:?e?d??nt] n. 反应物、试剂、 [?k?uin?said] vi. 与…一致、想法、意见等相同、相符、 极为类似、[st??k?‘?m?tr?k] 化学当量的、化学计算的、 [i?kwiv?l?nt] adj. 相等的、相当的、等效的、等价的、等积的、[化学]当量的、n. 对等物、[化学]当量 通过滴定，您可以准确地确定需要多少试剂才能使测试溶液完全反应。通常，反应的完成是由反应体系中突然可见的变化所指示的，这种变化与试剂溶液或等效物与试液中反应物之间的化学计量关系一致。 ;A drop or two of an appropriate indicator solution produces a color change at the point where the reaction is complete-referred to as the endpoint. [??pr?upriit] adj. 适当的、恰当的、 合适的 [??nd??ke?t?n]. 指示器、[化]指示剂、指示者 一滴或两滴合适的指示剂溶液会在反应完成时产生颜色变化--称为终点。;Molarity is the number of moles ( gram-molecular weights ) of substance per liter [?li:t?] of solution. The mole weight of sulfuric acid is 98.08 g, and therefore, 1 mole of H2SO4 contain 98.08 g. If 49.04 g are diluted to 1 liter then the concentration is 0.49 or 0.5 mol. [m?u?l?riti] n. 摩尔浓度、di