2.2.20. POTENTIOMETRIC TITRATION 电位滴定牵引力控制系统
In a potentiometric titration the end-point of the titration is
determined by following the variation of the potential difference between 2
electrodes (either one indicator electrode and one reference electrode or 2
indicator electrodes) immersed in the solution to be examined as a function of
the quantity of titrant added.
在一个电位滴定中，滴定终点判定是依据浸入被测液中两支电极（或者是一支指示电极一支参比电极，或者是两支指示电极）之间的电位差，对应加入滴定液的数量。 The potential is usually measured at zero or practically zero
current.
电位一般在零点测量，或在零点电流。
Apparatus. The apparatus used (a simple potentiometer or electronic
device) comprises a voltmeter allowing reading to the nearest millivolt.
仪器：所用仪器（一个简单的电位计或电极装置）包括一个可以准确读至毫伏的电位计。
The indicator electrode to be used depends on the substance to be
determined and may be a glass or metal electrode (for example, platinum, gold,
silver or mercury). The reference electrod is generally a calomel or a
三字格成语silver-silver chloride electrode.
所用的指示电极依赖于所检测的物质，可以是玻璃电极或金属电极（例如，铂电极、金电极、银或水银电极）。参比电极一般是甘汞电极或银-氯化银电极。
For acid-base titrations and unless otherwise prescribed, a
glass-calomel or glass-silver-silver chloride electrode combination is used.
对于酸碱电极，如未另加说明，一般使用玻璃甘汞电极或玻璃ABOVING-银园林设计-氯化银复合电极。
Method. the solvent mixture is neutralized, if necessary, before
陇西地震dissolution of the substance to be examined. Plot a graph of the variation of
potential difference as a function of the quantity of the titrant added, continuing王德华
the addition of the titrant beyond the presumed equivalence point. The end-point
corresponds to a sharp variation of he potential difference.
方法：如有必要，在被测样品溶解前，中和溶液混合物使呈中性。以电位变化和滴定液加入量作图，继续滴加至预定的平衡点。终点对应电位变化突跃点。
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