MadSci Network: Chemistry
Query:

Re: How do I make a baking soda + vingar pipette move?

Date: Tue May 4 20:52:15 1999
Posted By: Robert L. Judge, Faculty, Chemistry/Science Department, Holy Cross High School
Area of science: Chemistry
ID: 922418069.Ch
Message:

Kelly,
It would seem to me that you would need to introduce the vinegar quickly and 
then release the pipet to let it move.  From what you wrote, I am assuming 
that you are trying to make a jet propulsion pipet.  If this is to be 
floated on water, then perhaps you can fill the pipet with some baking soda, 
and then float it in the vinegar solution.  Squeeze the pipet which will 
allow it to draw up the vinegar solution.  The reaction will take place, and 
the CO2 generated should keep the pipet afloat and propel it.  You will have 
to experiment with the proportions to get it right.  While it may be 
difficult to get the baking soda into the pipet, it may work best if you 
draw it up as you would a fluid.
P.S. I would not cut the tip of the pipet.

Good luck

Robert L. Judge



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