vCalcium-based antacids: Tums, Rennies

CaCO3 + 2HCl ¨ CaCl2 + H2CO3
H2CO3 ¨ H2O + CO2

vMagnesium-based antacids: Mylanta, Milk of Magnesia

Mg(OH)2 + 2HCl ¨ MgCl2 + 2H2O

vAluminum-based antacids: Maalox, Mylanta

Al(OH)3 + 3HCl ¨ AlCl3 + 3H2O

vBicarbonate-based antacids: Alka Seltzer

NaHCO3 + 1HCl ¨ NaCl + H2CO3
Commercial Antacids Use A Variety of Chemicals