posted by Jennifer Todd on .
If a tablet of TUMS contains 500mg of the active ingredient, CaCO3, how many tablets would it take to neturalize the 1.5g of HCl?
From balanced equation: CaCO3 + 2HCl = CaCl2 + H2O + CO2
500 mg = 0.500g
mols HCl = g/molar mass = 1.5/30.0416.5 = approximately 0.041 but you need to do it more accurately.
mols CaCO3 = 0.041 mols HCl x (1 mol CaCO3/2 mol HCl) = 0.041 x 1/2 = approx 0.02 mols CaCO3.
g CaCO3 = mols x molar mass = approx 0.02 x 100 = approx 2 g CaCO3.
Then (0.500 g CaCO3/tab) x # tab = 2g.
Solve for # tabs.