分析化学试题分析及答案（Analysis of analytical chemistry questions and answers）.docVIP

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分析化学试题分析及答案（Analysis of analytical chemistry questions and answers）.doc

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分析化学试题分析及答案（Analysis of analytical chemistry questions and answers）

分析化学试题分析及答案（Analysis of analytical chemistry questions and answers） The first chapter is quantitative analysis Thinking question 1, in order to explore the accumulation of industrial pollutants in sediment of a river basin, a unit of raw material collected in different areas of the original average sample, after mixing, take some samples sent to the analysis department. The researchers said a certain amount of sample should be taken and treated to determine the harmful chemical components in different ways. I ask, is that right? Why? Answer: No. The original sample should be sent to the analysis department, and then the analysts will use the four point method to shrink the original sample, and then to sample, decompose and determine the sample according to the empirical formula. 2, the nickel containing a small amount of copper and silver. For determination of copper and silver among them, someone will be cleaning the surface of nickel, nickel dissolved directly with dilute HNO3 solution preparation part. According to the quality of dissolved nickel in weighing the difference before and after, to determine the quality of the sample. Then the content of copper and silver in solution was determined by different methods. I ask, is that right? Why? Answer: No. It should be dissolved because of nickel in nickel, copper and silver distribution is not uniform, do not representative sampling. 3, how to dissolve the following samples: tin bronze, Gao Wugang, aluminum, nickel, glass Answer: Bronze: HNO3; H3PO4; high tungsten: pure aluminum HCl; nickel: HNO3; glass: HF. 4, the following samples should be used and what crucible melting flux: chromite, Jin Hongshi, cassiterite, ceramic Answer: chromite: Na2O2 flux, iron, silver, corundum crucible Jin Hongshi: acid flux, quartz or platinum crucible Cassiterite: acid flux, quartz or platinum crucible Ceramics: basic flux, iron, silver, corundum crucible 5, to determine the content of zinc alloy Fe, Ni, Mg, what solvent should be u