HCl is used for two reaction: reaction with antacid and for titration with NaOH
Find moles of HCl
"n(HCl) = 0.0981\\times 0.025 = 0.00245 mol"
Find moles of HCl used for titration:
"NaOH + HCl \\rightarrow NaCl + H_2O"
"n(HCl) = n(NaOH) = c\\times V = 0.104\\times0.00583 = 0.000606 mol"
Fnd moles of HCl used for reaction with antacid:
"n(HCl) = 0.00245 - 0.000606 = 0.00184 mol"
Find moles of CaCO3:
"CaCO_3 + 2HCl \\rightarrow CaCl_2 + H_2O + CO_2"
"n(CaCO_3) \\frac{n(HCl)}{2} = \\frac{0.00184}{2} = 0.000922 mol"
a) Find mass of CaCO3:
"m=M\\times n = 100.09\\times 0.000922 = 0.0923 g"
b) find mass percent of CaCO3 in antacid:
"mass\\% =\\frac{0.0923}{0.204}\\times 100\\% = 45.2 \\%"
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