Many facial cleansers and other products we use in our life contain potassium hydroxide. Adding it can have a good cleaning effect. However, because it is easy to deteriorate and is not easy to be found, if the deteriorated products are directly added, the cleaning effect of the finished products will be weakened, Today, Xiaobian will take you to see the additional measurement method of deterioration.

1、往样品当中添加进去澄清的石灰水，如果发现有偶白色沉淀的出现生成，那么说明氢氧化钾出现了变质的情况。

1. Add clarified lime water to the sample. If even white precipitation is found, it indicates that potassium hydroxide has deteriorated.

2、如果往样品当中滴加进去过量的稀盐酸发现有气泡的出现，那么说明产品已经出现了变质的情况。

2. If excessive dilute hydrochloric acid is added to the sample and bubbles are found, it indicates that the product has deteriorated.

3、还可以往样品当中添加进去氯化钡，如果发现有白色沉淀的生成，那么说明产品已经出现了变质的情况。

3. Barium chloride can also be added to the sample. If white precipitation is found, it indicates that the product has deteriorated.

氢氧化钾

Potassium hydroxide

4、还有就是检产品部分变质的时候可以通过往当中加入进去过量氯化钡一直等到完全沉淀，等到沉淀已经静止之后取上层的清液放置在试管当中，然后往当中滴加无色的酚酞溶液，如果酚酞变红了那么就说明当中是有碱性物质的。

4. In addition, when the product is partially deteriorated, you can add excess barium chloride into it until it is completely precipitated. After the precipitation has stopped, take the upper clear liquid and place it in the test tube, and then drop colorless phenolphthalein solution into it. If phenolphthalein turns red, it indicates that there are alkaline substances in it.

5、如果往当中加入进去过量氯化钡2：1如果有白色沉淀的生成，那么就说明产品出现了部分变质的情况。

5. If excessive barium chloride 2:1 is added into it, if white precipitation is formed, it indicates that the product has been partially deteriorated.

6、加入无色酚酞如果无色酚酞不变色那么就说明已经是完全变质了。如果无色酚酞已经变红了那么就说明只是部分变质，其中还有一部分的产品是有一些效果的。

6. Add colorless phenolphthalein. If colorless phenolphthalein does not change color, it indicates that it has completely deteriorated. If the colorless phenolphthalein has turned red, it means that it is only partially deteriorated, and some of the products have some effects.

上面介绍的就是氢氧化钾是否变质的检测方法，因为产品本身在变质之后是无法进行使用的，所以我们在经过检测之后发现已经变质那么需要及时的进行处理不再进行使用，还有就是在进行检测的时候需要注意一定不要随意的往当中添加其他的化学物质。

The above is the detection method of whether potassium hydroxide has deteriorated. Because the product itself cannot be used after deterioration, we need to deal with it in time and no longer use it after detection. In addition, we need to pay attention not to add other chemicals to it at will when testing.