For the identification of the quality of magnesium chloride, we know that there is a very simple method, that is, to observe its aqueous solution. Take a transparent cup, put in the appropriate water, add magnesium chloride, dissolve the magnesium chloride and leave it for a while. At this point we will find a little white insoluble precipitate on the bottom of the cup. The more white insolubles, the lower the purity, and the high purity magnesium chloride is extremely small in white insoluble matter. So what exactly are these white insolubles?
In fact, these substances are impurities such as sodium chloride, potassium chloride, and magnesium sulfate. Although these materials are easily soluble in water, the chloride ions in the aqueous magnesium chloride solution are saturated by the action of the same ion effect, so that these salts have little solubility in a high concentration of magnesium chloride solution, and when the concentration of magnesium chloride is high, these salts are almost Not dissolved. Therefore, we can use this method to judge the content of impurities. White flocs are often impurities such as sodium chloride, and other turbid materials are often impurities of water insolubles.
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Post time: Jul-31-2019