第十五章单元测试
- The part of a spectrophotometer that selects the wavelength of light used to irradiate the sample is called the （ ）
- Which method can be used to measure the degree of dissociation (解离度) of the colored complex?（ ）
- What kind of blank solutions can be used when reagent, analyte and chromogenic reagent(显色剂) are colorless? （ ）
- The function of NH2OH·HCl is…（ ）
- How to obtain the optimal pH range? （ ）
- Which apparatus have been used to prepare the medicine solution?（ ）
A:monochromator B:light source C:cuvette(比色皿) D:detector
答案:monochromator
A:Continuous variations method B:Mole ratio method C:Mole variations method
A:No options available B:reagent blank(试剂空白) C:solvent blank(溶剂空白) D:analyte blank(试液空白)
A:to form colored complex with Fe B:to form colored precipitate with Fe C:to reduce Fe3+ to Fe2+ D:to oxidize Fe2+ to Fe3+
A:then find the pH range where the absorbance is maximum and stable B:first plot an A-c curve C:then find the concentration(c) range where the absorbance(A) is maximum and stable D:first plot an A-pH curve
A:quantitative filter paper(定量滤纸) B:volumetric flask(容量瓶) C:analytical balance D:glass funnel
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