Posted by DEBBIE on Monday, March 22, 2010 at 7:49pm.
Assuming NaHCO3 is the active ingredient in Alka-Seltzer that would react with vinegar,
2NaHCO3 + 2HC2H3O2(vinegar) ==> 2NaC2H3O2 + 2CO2 + 2H2O
Convert grams CO2 to moles CO2. moles = grams/molar mass.
Using the coefficients in the balanced equation, convert moles CO2 to moles vinegar.
Convert moles vinegar to grams. grams = moles x molar mass.
To get to the volume of vinegar from the grams vinegar, you need to know the percent acetic acid in vinegar. I have seen both 4% acetic acid and 5% acetic acid at the store for vinegar. If we use 4%, the number will be larger and the questin asks for maximum volume so let's use that figure. I will call acetic acid HAc.
percent acetic acid = (4 g HAc/100 g solution)
Therefore, 100 g soln x (g vinegar needed/4) = ??
Now you have grams vinegar. Convert to mL using the density of vinegar of 1.01 g/mL.
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