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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)-

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Presentation on theme: "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)-"— Presentation transcript:

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

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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) MgCl 2 (aq) + H 2 O (l) Mg(OH) 2 (s) + 2 HCl (aq) MgCl 2 (aq) + 2 H 2 O (l) Al(OH) 3 (s) + 3 HCl (aq) AlCl 3 (aq) + 3 H 2 O (l) CaCO 3 (s) + 2 HCl (aq) CaCl 2 (aq) + CO 2 (g) + H 2 O (l) NaHCO 3 (s) + HCl (aq) NaCl (aq) + CO 2 (g) + H 2 O (l)

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


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