1. 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

3. 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

4. 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)

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