As we all know, potassium hydroxide, as a chemical product, can be used in many experiments. In fact, not all of the finished products are made of it, but also doped with other impurities. Generally, we will choose products with different content according to different needs, so we need to test the content at this time. So, let's take a look at how to test it.

　　1、在測定氫氧化鉀之前需要先配制好0.1mol/L的鹽酸標準滴定溶液。

　　1. A 0.1mol/l hydrochloric acid standard titration solution needs to be prepared before the determination of potassium hydroxide.

　　基準物：需要使用無水碳酸鈉；

　　Reference material: anhydrous sodium carbonate is required;

　　指示劑：需要使用甲基紅-溴甲酚綠；

　　Indicator: methyl red bromocresol green is required;

　　終點顏色：等到甲基紅-溴甲酚綠從綠色變為暗紅色即可；

　　End color: wait until methyl red bromocresol green changes from green to dark red;

　　計算公式：c（HCl）=2m（碳酸鈉）/M（碳酸鈉）*V（HCl）。

　　Calculation formula: C (HCl) = 2m (sodium carbonate) / M (sodium carbonate) × V (HCl).

　　2、滴定

　　2. Titration

　　使用的稱量工具稱出0.15g等待檢測的氫氧化鉀樣品放置在錐形瓶里面，需要加水將其溶解，然后滴入1～2滴甲基橙指示劑，在使用鹽酸標準溶液滴定溶液從黃色變為橙色就可停止了。

　　Use a professional weighing tool to weigh 0.15g of potassium hydroxide sample to be tested and place it in a conical flask. First, add water to dissolve it, then drop 1-2 drops of methyl orange indicator, and then titrate it with hydrochloric acid standard solution until the solution changes from yellow to orange.

　　計算公式：w%=[c（HCl）*V（HCl）*M（樣品）/m（樣品）]*100%；

　　Calculation formula: W% = [C (HCl) × V (HCl) × m (sample) / M (sample)] * 100%;

　　c:代表鹽酸標液的濃度含量；

　　c: Represents the concentration content of hydrochloric acid standard solution;

　　V：表示所用鹽酸標液的體積大小；

　　5: Indicates the volume of hydrochloric acid standard solution used;

　　M：代表需要測試產品的摩爾質量；

　　M: Represents the molar mass of the product to be tested;

　　m：表示稱取的樣品的質量，在本次實驗當中的數值為0.15。

　　m: Represents the mass of the weighed sample, the value in this experiment is 0.15.

　　以上介紹的就是在實驗室當中我們測定氫氧化鉀含量的方法，由于在使用的時候對產品的含量要求是需要準確數據的，所以這就要求試驗過程中我們需要注意操作正確，同時還要避免出現危險事故，畢竟其也是屬于強堿性質的，不要直接用手或皮膚接觸。

　　The above is the method for determining the content of potassium hydroxide in the laboratory. Since the content of the product requires accurate data when it is used, we need to pay attention to the correct operation during the test process, and avoid dangerous accidents. After all, it is also a strong alkali, so do not directly contact with hands or skin.