In the chemical industry, different products have different storage methods, because they have different characteristics and different requirements for storage environment, so the selection of storage containers should be very cautious. Potassium hydroxide solution is a highly alkaline chemical, usually contained in glass bottles, but corks cannot be made of glass. So why can't it use frosted glass plug? The analysis is as follows.
In a glass bottle, Koh is a strong alkali, just like a ground glass stopper. SiO2 exists in glass and reacts with KOH to form k2SiO3. But the response was slow. The inside of the glass bottle is very smooth and the reaction is very slow, so there will not be much reaction basically.
However, because the mouth of the frosting bottle is rough, the contact area between the potassium hydroxide solution and the glass will increase, making the reaction faster. After k2SiO3 is generated, it will stick to the bottle mouth and cannot be opened. So switch to rubber plugs. In addition: even frosted holes will react very slowly and will not open for a month or two before they get stuck. However, no one uses the old potassium hydroxide solution, so the probability of adhesion is still relatively large, so they use rubber plugs.
The above is the reason why frosted glass stopper cannot be used for potassium hydroxide, and it is also the reason why the rubber of potassium hydroxide bottle stopper needs to be replaced. I hope you can understand so that you can choose the right cork in the future. Strong alkali is not only concerned about the details of storage containers and corks, but also about many other things we need to know.