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、往樣品當中添加進去澄清的石灰水，如果發現有偶白色沉淀的出現生成，那么說明氫氧化鉀出現了變質的情況。

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

2、如果往樣品當中滴加進去過量的稀鹽酸發現有氣泡的出現，那么說明產品已經出現了變質的情況。

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

3、還可以往樣品當中添加進去氯化鋇，如果發現有白色沉淀的生成，那么說明產品已經出現了變質的情況。

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

氫氧化鉀

Potassium hydroxide

4、還有就是檢產品部分變質的時候可以通過往當中加入進去過量氯化鋇一直等到完全沉淀，等到沉淀已經靜止之后取上層的清液放置在試管當中，然后往當中滴加無色的酚酞溶液，如果酚酞變紅了那么就說明當中是有堿性物質的。

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、如果往當中加入進去過量氯化鋇2：1如果有白色沉淀的生成，那么就說明產品出現了部分變質的情況。

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、加入無色酚酞如果無色酚酞不變色那么就說明已經是完全變質了。如果無色酚酞已經變紅了那么就說明只是部分變質，其中還有一部分的產品是有一些效果的。

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.

上面介紹的就是氫氧化鉀是否變質的檢測方法，因為產品本身在變質之后是無法進行使用的，所以我們在經過檢測之后發現已經變質那么需要及時的進行處理不再進行使用，還有就是在進行檢測的時候需要注意一定不要隨意的往當中添加其他的化學物質。

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.