OK... let’s say a reaction says to drop a solution into another one over a period of 10 hours or so... how do you estimate that the solution will be completely dropped out exactly at the 10 hour mark? Is there a dropping funnel that allows for precise timing?
Never heard of such a system...You can do some trials first but I guess that is not the answer you wanna hear.
In a real laboratory they use tubing pumps or syringe pumps for this. My ghetto variation to have a certain flow of liquid: use a large syringe, attach this with a hose to the reaction flask and use a motor to drive the plunger. The speed of the movement of the plunger, hence the rotation of the motor, should be adjustable. If you want to make it yourself you should do some testing to find out what speed corresponds to what settings. And be sure to stop in time otherwise your motor won´t like it.
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