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D2 Antacids

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 ?.

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D2 Antacids

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  1. D2 Antacids • The stomachcontainsgastric juices; HCl (aq) with pH about 2 • Dyspepsia- excess acid. Antacidsmayhelp by neutralizing the acid • Ulcers (magsår)- prevent acid from attacking the damagedstomachlining

  2. How do theywork? • Antacidsareiftenweakbasessuch as metal oxides, carbonates, hydrogen carbonates • Someantacidswork by physicallyabsorbing the acid- magnesium trisilicate • The antacidprevents inflammation, relieve pain, protect the mucuslayer • Alginates- a polymer that forms a protectivelayer- stops heartburn • Anti-foaming agents preventflatulence, dimethicone

  3. 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)

  4. Problems • Why is aluminium hydroxide a weakbasewhen sodium hydroxide is a strong base? NaOH Al(OH)3

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