D2 Antacids The stomach contains gastric juices; HCl (aq) with pH about 2 Dyspepsia- excess acid. Antacids may help by neutralizing the acid Ulcers (magsår)- prevent acid from attacking the damaged stomach lining

How do they work? Antacids are iften weak bases such as metal oxides, carbonates, hydrogen carbonates Some antacids work by physically absorbing the acid- magnesium trisilicate The antacid prevents inflammation, relieve pain, protect the mucus layer Alginates- a polymer that forms a protective layer- stops heartburn Anti-foaming agents prevent flatulence, dimethicone

Neutralisation General: Base + acid salt + water MgO (s) + 2 HCl (aq) MgCl2 (aq) + H2O (l) Mg(OH)2 (s) + 2 HCl (aq) MgCl2 (aq) + 2 H2O (l) Al(OH)3 (s) + 3 HCl (aq) AlCl3 (aq) + 3 H2O (l) CaCO3 (s) + 2 HCl (aq) CaCl2 (aq) + CO2 (g) + H2O (l) NaHCO3 (s) + HCl (aq) NaCl (aq) + CO2 (g) + H2O (l)

Problems Why is aluminium hydroxide a weak base when sodium hydroxide is a strong base? NaOH Al(OH)3