Potassium hydroxide is used in cosmetics in many fields, so the quality required for use time is relatively high. If there are many other components of the word in use, it may achieve the expected effect, even if the use of cosmetics is harmful to the skin, then how can we determine when to use the amount of impurities?

　　1,你需要使用平衡准确的样品重量在1.5到2.0 g,然后放置在中间的250毫升烧杯,并添加蒸馏水溶解,溶解后等待完全可以导入到容量瓶的大小相同,并使用溶解在水中能阻止加入250毫升水。

　　1. First, you need to use a balanced and accurate sample weight of 1.5 to 2.0 g, then place it in a 250 ml beaker in the middle and add distilled water to dissolve it. After dissolving, wait until it can be completely imported into the volumetric flask of the same size, and use dissolving in water to prevent the addition of 250 ml water.

　　2. 将溶解后的溶液平均倒入三个锥形瓶中，并加入两滴酚酞指示剂。在那之前使用盐酸溶液,添加滴氢氧化钾溶液由红色变成没有颜色可以停止补充道,然后用来记录盐酸的体积和加2滴甲基橙指示剂,也知道用盐酸标准溶液滴定溶液可以停止增加橙色。

　　2. Pour the solution into three conical flasks and add two drops of phenolphthalein indicator. Before that, use hydrochloric acid solution, add drops of potassium hydroxide solution from red to no color to stop the supplement, then use it to record the volume of hydrochloric acid and add 2 drops of methyl orange indicator, also know that titration with hydrochloric acid standard solution can stop the increase of orange.

　　3.然后记录两次加入盐酸溶液的体积，计算产品中的杂质含量。

　　3. Then record the volume of hydrochloric acid solution added twice and calculate the impurity content in the product.

　　以上描述的是测定氢氧化钾杂质含量的方法，我们必须清楚什么时候使用什么是杂质，也是我们正常使用不会造成负面影响的，所以这也要求我们在购买时一定要选择质量更好的。

　　The method described above is to determine the impurity content of potassium hydroxide. We must know when to use what is impurity, and our normal use will not have a negative impact, so it also requires us to choose a better quality when purchasing.