现代仪器分析课后答案（Answers to modern instrumental analysis）.docVIP

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现代仪器分析课后答案（Answers to modern instrumental analysis）.doc

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现代仪器分析课后答案（Answers to modern instrumental analysis）

现代仪器分析课后答案（Answers to modern instrumental analysis） Modern instrumental analysis problem solving The twelfth chapter is potential analysis and ion selective electrode analysis P216 1. what is potentiometric analysis? What is ion selective electrode analysis? Answer: the electrochemical analysis of the activity or concentration of a substance to be measured by means of the relationship between the electrode potential and the activity or concentration of an ion in the solution is called potentiometry. Potentiometric analysis using an ion selective electrode as an indicator electrode is called ion selective electrode analysis. 2. what are the indicating electrodes and reference electrodes in potentiometric analysis? Whats the difference between a metal based electrode and a membrane electrode? Answer: in electrochemistry, the potential changes with the activity or concentration of the ion to be measured in the solution, and the electrode that reflects the activity or concentration of the ion to be measured is called the indicating electrode. The electrode with constant electrode potential, which is not affected by the composition of the solution or the direction of the current flow, is referred to as a reference electrode. The sensitive film of metal base electrode is made by melting the rigid matrix glass of ion exchange type. The sensitive film of membrane electrode is a single crystal, polycrystalline or mixed crystalline active film which is produced by pressing or drawing the metal insoluble salts in water. 4. what is TISAB solution? What are its functions? Answer: in the determination of the solution by adding a large number of ions do not interfere with the inert electrolyte, and the appropriate amount of pH buffer and certain masking agent, constitute the total ionic strength adjustment buffer (TISAB). Its functions include constant ionic strength, controlling pH, eliminating interference ion and stabilizing liquid junction potential. 5.25 degrees, the measured