Chemistry Forum

Thank you very much :) Update The use of acid was not necessary. The setting stem (1.5mm long) was removed and the crown survived :) It took several hours. 55g of alum (I don't know if it was NH4Al(SO4)2 or AlK(SO4)2) dissolved in water, 300ml of solution in total. The key was to heat this solution ...

Oh, the term crystallization was unfortunate. I meant the setting stem consistency after the reaction with the solution. More like a grain. And as I wrote before, I am not a chemist. English is also not my native language. According to Your opinion, what concentration of the acid would have to be in...

Thank you for Your response. ad.1 and ad.3 However, something happens that the setting stem can be easily removed by means of a solution of alum with water, for example with a needle. Maybe it's fake or some kind of magic :wink: but You can check this out on YouTube (you need to remove spaces from t...

ad.1. I wrote what I want to achieve. Remove the broken setting stem from the watch's crown.The setting stem is to crystallize in order to be able to pick it out. Without any mechanical intervention such as drilling or cutting. I don't have the precision tools to do it this way without damaging the ...

I am not a chemist, but I would like to understand what happens in the following situation. On the practical side, it is about the reaction of the alum with the setting stem that is stuck in the crown of the watch. The effect is to be such that the setting stem of the watch is to break out (crumble)...