Posted by stacey on Sunday, June 6, 2010 at 3:42pm.
It isn't possible to calculate the theoretical molarity of vinegar without know the density. I tried looking up the density of vinegar on the net and found values all the way from 0.96 g/mL to 1.08 g/mL (and some said 5% by mass and other 5% by volume).
5% by mass vinegar means 5 g CH3COOH/100 g solution. 5 g is 5/60.05 = 0.083 moles/100 g soln. If the density of the vinegar is 1.00 g/mL then the M = 0.083/0.1 = 0.83 M.
If you know the density, then volume = mass/density = 100/density and moles/L = M.
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