醋酸钠为什么会出现变色的情况？
来源：http://www.jnjdbc.com 日期：2020-07-31 发布人：admin
醋酸钠一般以带有三个结晶水的三水合乙酸钠形式存在。在运用的过程中，有时分会发现本来是白色的醋酸钠的颜色会变为其他颜色，而液体醋酸钠的颜色为浅黄色。
Sodium acetate generally exists in the form of sodium acetate trihydrate with three crystal water. In the process of application, sometimes found that the color of white sodium acetate will change into other colors, and the color of liquid sodium acetate will be light yellow.
1.醋酸钠很容易溶于水，活性强，当增加有其他颜色的金属时，会出现醋酸钠将其他颜色显着的突显出来，使全体的颜色改动。
1. Sodium acetate is easily soluble in water and has strong activity. When metal with other colors is added, sodium acetate will highlight other colors and change all colors.
2.醋酸钠制备过程中，很多是经过离子反响或氧化发作，本体较活泼。一旦掺入重金属元素在其间，由于这些便是杂质离子，会使醋酸钠晶格曲线歪曲变形以于失掉对称性而发作效果。
2. In the process of preparation of sodium acetate, many of them go through ion reaction or oxidation attack, and the body is more active. Once the heavy metal elements are mixed in it, because these are impurity ions, the lattice curve of sodium acetate will be distorted, so that the symmetry will be lost and the effect will occur.
3.不同重金属的特点不同，不同特点的醋酸钠对杂质的灵敏度不同，在掺入后，会有不同反响。
3. The characteristics of different heavy metals are different. Sodium acetate with different characteristics has different sensitivity to impurities, and will have different reactions after doping.
4.一般醋酸钠本体是白色的，运用中，难免会参杂其他物质时分，一些重金属的颜色比较重，会对白度发作显着的效果影响。例如铬、锰、铁、铜、钻、铈、钒、铅等等重金属，构成醋酸钠杂质，即便是很少的量就可以是醋酸钠出现出重金属的颜色。
4. In general, sodium acetate is white. When it is used, it is inevitable to mix other substances. When some heavy metals are heavy in color, it will have a significant effect on the whiteness attack. For example, chromium, manganese, iron, copper, cobalt, cerium, vanadium, lead and other heavy metals constitute sodium acetate impurities, even if a small amount of sodium acetate can appear in the color of heavy metals.
5.重金属的参入量和不同特点的醋酸钠，颜色的改动状况不相同。金红石型的醋酸钠对杂质的影响更为灵敏，假如氧化铁在金红石型醋酸钠中的含量大于0.003%时，就会出现颜色，而在锐钛型醋酸钠中的含量要大于0.009%才会发作颜色反响。
5. The content of heavy metals and the change of color of sodium acetate with different characteristics are different. Rutile sodium acetate is more sensitive to impurities. If the content of iron oxide in rutile sodium acetate is greater than 0.003%, color will appear, while in anatase sodium acetate, color reaction will occur when the content is greater than 0.009%.
醋酸钠在水溶液中，是一种很弱的碱（pKb=9.24），不能在水中用强酸准确滴定，因此需用非水滴定法。选择适当的溶剂如冰醋酸则可大大提高醋酸钠的碱性。
Sodium acetate in aqueous solution is a very weak base (PKB = 9.24), which can not be accurately titrated with strong acid in water, so non-aqueous titration is needed. The alkalinity of sodium acetate can be greatly improved by choosing appropriate solvent such as glacial acetic acid.
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