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Question

Posted on: March 6 2013

A dentist asks me to make the following solution: NaEDTA 15g cetrimide 0.75 g water AD 100ml

After some time, a precipitation occurs, which can cause a blockage of the needle.

Answer

I can assume that you have used purified water EF. The only possibility of precipitation that I see is an interaction of Cetrimide + with EDTA-.

I do not immediately see an opportunity to avoid that interaction.