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离子选择性电极除了作为一种分析工具外,还可应用于电解质溶液的热力学性质的研究。本工作是用离子选择性电极组成的无液接测量电池来测定 NaCl 的平均活度系数。一、原理用氯离子选择性电极和钠离子选择性电极可以构成下列无液接测量电池:Na~+—ISE|Na~+,Cl~-|Cl~-—ISE该电池的电动势为:E=E°_Cl~--E°_Na~+-SCl~-logaCl~--S_Na+logaNa~+(1)若 S_Cl~-=S_Na~+=S,E°=E°Cl~--E°_Na~+,则(1)式可写成:
In addition to being an analytical tool, ion-selective electrodes can also be used to study the thermodynamic properties of electrolyte solutions. This work is the determination of the average activity coefficient of NaCl using a liquid-free measuring cell consisting of ion-selective electrodes. First, the principle Chloride ion selective electrode and sodium ion selective electrode can constitute the following non-liquid junction measurement of the battery: Na ~ + -ISE | Na ~ +, Cl ~ - | Cl ~ --ISE The electromotive force of the battery: E = E ° _Cl ~ -E ° _Na ~ + -SCl ~ -logaCl ~ - S_Na + logaNa ~ + If S_Cl ~ - = S_Na ~ + = S, E ° = E ° Cl ~ --E ° _Na ~ +, then (1) can be written as: