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氟硅酸钾容量法测二氧化硅分析中,为使氟硅酸钾沉淀完全和避免其它盐类的氟化物沉淀必须控制沉淀过程中酸和氯化钾的加入量。本文就此进行了讨论并对方法做了相应的改进。 一、KCl饱和加入量的计算 KCl饱和加入量的计算是:已知溶液一定体积于一定的室温下,假定溶液为水,根据KCl的溶解度计算出KCl溶解的最大克数,然后减去溶液中介质不能溶解KCl的克数,即得KCl饱和加入量。 沉淀K_2SiF_6不外乎硝酸、盐酸、硝酸—盐酸介质中进行。溶液中酸介质不能溶解KCl的克数分别
Potassium fluorosilicate volumetric assay In the silica analysis, the addition of acid and potassium chloride to the precipitation process must be controlled in order to precipitate potassium fluorosilicate completely and to avoid fluoride precipitation in other salts. This article discussed this and made corresponding improvements to the method. First, the calculation of the amount of KCl saturated KCl saturated amount added is calculated: a certain volume of known solution at a certain room temperature, assuming the solution is water, according to the solubility of KCl calculated KCl maximum grams dissolved, and then subtract the solution Medium can not dissolve KCl grams, that was KCl saturated addition. Precipitation K_2SiF_6 nothing more than nitric acid, hydrochloric acid, nitric acid - hydrochloric acid medium. Acid solution in the solution can not dissolve the number of KCl, respectively