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,你需要使用平衡準確的樣品重量在1.5到2.0 g,然后放置在中間的250毫升燒杯,并添加蒸餾水溶解,溶解后等待完全可以導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. 將溶解后的溶液平均倒入三個錐形瓶中，并加入兩滴酚酞指示劑。在那之前使用鹽酸溶液,添加滴氫氧化鉀溶液由紅色變成沒有顏色可以停止補充道,然后用來記錄鹽酸的體積和加2滴甲基橙指示劑,也知道用鹽酸標準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.然后記錄兩次加入鹽酸溶液的體積，計算產品中的雜質含量。

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

　　以上描述的是測定氫氧化鉀雜質含量的方法，我們必須清楚什么時候使用什么是雜質，也是我們正常使用不會造成負面影響的，所以這也要求我們在購買時一定要選擇質量更好的。

　　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.