Potassium hydroxide is a familiar chemical product, mainly white translucent crystalline solid. In fact, what we don't understand is that chemical products are easy to deteriorate due to their own characteristics, but it is difficult to distinguish them. At this time, we need to have a complete set of methods to detect their qualitative changes. Then, let's give you a specific explanation.

一、样品中滴加澄清石灰水，若有白色沉淀生成，则氢氧化钾变质。

1、 Clear lime water is added to the sample. If white precipitate is formed, potassium hydroxide will deteriorate.

二、样品中滴加过量稀盐酸若有气泡产生，则产品变质。

2、 If excessive dilute hydrochloric acid is dripped into the sample, the product will deteriorate if there are bubbles.

三、样品中加氯化钡，若有白色沉淀生成，则该产品变质。

3、 If barium chloride is added to the sample, if white precipitate is formed, the product will deteriorate.

四、检验氢氧化钾部分变质：

4、 Inspection of partial deterioration of potassium hydroxide:

1、加入过量氯化钡完全沉淀，待沉淀完全静止后，取上层清液于试管内，滴加无色酚酞溶液，酚酞变红，则证明有NaOH。

1. Add excess barium chloride to precipitate completely. After the precipitate is completely static, take the supernatant into the test tube and drop colorless phenolphthalein solution. If phenolphthalein turns red, it is proved that there is NaOH.

2、在产品中加入过量氯化钡2：1.若有白色沉淀生成，则说明该产品变质

2. If white precipitate is formed, the product is deteriorated

3、加入无色酚酞，若无色酚酞不变色，则说明完全变质。若无色酚酞变红，说明部分变质。

3. Add colorless phenolphthalein, if colorless phenolphthalein does not change color, it means complete deterioration. If the colorless phenolphthalein turns red, it means that part of it is deteriorated.

以上就是关于氢氧化钾的变质检测方法介绍，产品变质后是不能在使用的，严重影响使用的效果。通过以上的介绍我们发现以上的检测方法主要是通过借助别种化工原料在进行的。因此，我们在进行检测的时候一定要注意，不要将这些化工原料乱放。

The above is about the deterioration detection method of potassium hydroxide. The product can not be used after deterioration, which seriously affects the effect of use. Through the above introduction, we found that the above detection methods are mainly carried out with the help of other chemical raw materials. Therefore, we must pay attention to safety when testing, do not put these chemical raw materials in disorder.