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Re:density of CaCO3

Steve Pushak asked                             

>What gives?? is my calcium carbonate powder heavier than everybody
else's by a factor of 2 !?? Or is it hygroscopic (absorbs water from the
air)? This is important because if it absorbs water, then the gram
weight per mole will be different.
You are dealing with the bulk density of the powder and it is not
unusual to have the bulk density vary by a factor of 2.  The bulk
density(sometimes called apparent density) of any material made into
powder will vary widely depending on the methods used to manufacture
it.  It would be interesting if those with access to accurate weighing
equipment would weight various chemicals we use to see how much they
do vary.
Jim Spencer
Sayre, PA

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