The alkaline water-alcohol solution

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Ramz
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The alkaline water-alcohol solution

Post by Ramz »

Hello. Sorry if my English is not good.

In microcircuitry the mixture of potassium hydroxide, water and isopropyl alcohol is known to etch silica. It is also known that the system separates into two phases with the presense of a lot of KOH in the bottom phase and a lot of IPA in the upper one. Please, help me with the explaining of stratification. And what concentrations of IPA, water and KOH I have in these phases. To prepare solution I use 9 ml of the 12% aqueous solution of KOH and 35 ml of the isopropyl alcohol.

Thanks.
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