Potassium hydroxide will be used in many cosmetic fields, so the requirements for its quality will be relatively high when it is used. If there are many other ingredients in it, it may not achieve the expected effect when it is used. Even if it is used in cosmetics, it is harmful to the skin, So how should we determine the amount of impurities when we use it.

1、首先需要使用天平称取出来准确的样品重量在1.5-2.0g，然后放置在250ml当中的烧杯当中，并且添加进去蒸馏水将其溶解开来，等到溶解完全之后就可以导入到同等大小的容量瓶当中，并且使用水溶解到250ml的时候就可以停止添加水了。

1. First, use the balance to weigh out the accurate sample weight of 1.5-2.0g, and then place it in a beaker of 250ml, and add distilled water to dissolve it. After the dissolution is complete, it can be introduced into a volumetric flask of the same size, and the addition of water can be stopped when the water is dissolved to 250ml.
                    

2、将溶解好的溶液平均的倒入三个锥形瓶当中同样的添加进去两滴酚酞指示剂。然后使用盐酸溶液滴加进去直到氢氧化钾溶液从红色变成了没有颜色的时候就可以停止添加了，然后记录下来使用过得盐酸体积并且添加进去2滴甲基橙指示剂，同样使用盐酸标准溶液进行滴定知道溶液变成橙色就可以停止添加。

2. Pour the dissolved solution evenly into three conical flasks, and add two drops of phenolphthalein indicator. Then add hydrochloric acid solution drop by drop until the potassium hydroxide solution changes from red to no color. Then record the volume of hydrochloric acid used and add 2 drops of methyl orange indicator. Similarly, titrate with hydrochloric acid standard solution until the solution turns orange.

3、然后再将二次滴加的盐酸溶液体积记录下来，然后根据此计算出产品当中的杂质含量。

3. Then record the volume of hydrochloric acid solution added twice, and calculate the impurity content of the product according to this.

上面介绍的就是确定氢氧化钾当中杂质含量的方法，我们在进行使用的时候一定要清楚当中所含有的杂质有哪些，还有就是会不会对我们的正常使用造成负面的影响，所以这也要求我们在进行购买的时候一定要选择质量比较好的。

The above is the method to determine the impurity content of potassium hydroxide. When we use it, we must know what impurities it contains, and whether it will have a negative impact on our normal use. Therefore, it also requires us to choose the one with better quality when we purchase.