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、在测定氢氧化钾之前需要先配制好0.1mol/L的盐酸标准滴定溶液。

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

　　基准物：需要使用无水碳酸钠；

　　Reference material: anhydrous sodium carbonate is required;

　　指示剂：需要使用甲基红-溴甲酚绿；

　　Indicator: methyl red bromocresol green is required;

　　终点颜色：等到甲基红-溴甲酚绿从绿色变为暗红色即可；

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

　　计算公式：c（HCl）=2m（碳酸钠）/M（碳酸钠）*V（HCl）。

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

　　2、滴定

　　2. Titration

　　使用的称量工具称出0.15g等待检测的氢氧化钾样品放置在锥形瓶里面，需要加水将其溶解，然后滴入1～2滴甲基橙指示剂，在使用盐酸标准溶液滴定溶液从黄色变为橙色就可停止了。

　　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.

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

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

　　c:代表盐酸标液的浓度含量；

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

　　V：表示所用盐酸标液的体积大小；

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

　　M：代表需要测试产品的摩尔质量；

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

　　m：表示称取的样品的质量，在本次实验当中的数值为0.15。

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

　　以上介绍的就是在实验室当中我们测定氢氧化钾含量的方法，由于在使用的时候对产品的含量要求是需要准确数据的，所以这就要求试验过程中我们需要注意操作正确，同时还要避免出现危险事故，毕竟其也是属于强碱性质的，不要直接用手或皮肤接触。

　　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.