Presentation is loading. Please wait.

Presentation is loading. Please wait.

(D2) Antacids Sarah Black. Background:  Humans naturally secrete gastric juices containing HCl, which… suppress growth of harmful bacteria help digestion.

Similar presentations


Presentation on theme: "(D2) Antacids Sarah Black. Background:  Humans naturally secrete gastric juices containing HCl, which… suppress growth of harmful bacteria help digestion."— Presentation transcript:

1 (D2) Antacids Sarah Black

2 Background:  Humans naturally secrete gastric juices containing HCl, which… suppress growth of harmful bacteria help digestion by hydrolysing protiens into amino acids  For various reasons (stress, over-eating) sometimes excess acid is produced, causing indigestion.  Antacids remedy this excess acidity.

3 About Antacids:  Antacids are bases Usually metal oxides, hydroxides, carbonates, or hydrogen carbonates  Over-the-counter antacids usually contain Al(OH) 3, Mg(OH) 2, CaCO 3, and NaHCO 3 as active ingredients. They may also contain alginates (prevent acid reflux), and anti-foaming agents such as dimethicone.

4 Action of Antacids:  MgO (s) + 2HCl (aq)  MgCl 2 (aq) + H 2 O (l)  Mg(OH) 2 (aq) + 2HCl (aq)  MgCl 2 (aq) + 2H 2 O (l)  Al(OH) 3 (s) + 3HCl (aq)  AlCl 3 (aq) + 3H 2 O (l)  CaCO 3 (s) + 2HCl (aq)  CaCl 2 (aq) + H 2 O (l) + CO 2 (g)  NaHCO 3 (aq) + HCl (aq)  NaCl (aq) + H 2 O (l) + CO 2 (g)  Mg 2 Si 3 O 8 (s) + 4HCl (aq)  3SiO 2 (aq) + 2H 2 O (l) + 2MgCl 2 (aq)

5 Side Effects of Antacids:  Aluminum hydroxide may cause constipation.  Aluminum ions can prevent uptake of phosphate ions due to precipitation of aluminum phosphate.  Magnesium hydroxide has laxative properties.  Calcium carbonate may result in kidney stones.  Sodium ions may lead to hypertension.  Excess use of sodium hydrogen carbonate may lead to alkalosis (basic stomach) and fluid retention.  Repeated use of calcium carbonate as an antacid may lead to excessive amounts of calcium ions being absorbed into the body.


Download ppt "(D2) Antacids Sarah Black. Background:  Humans naturally secrete gastric juices containing HCl, which… suppress growth of harmful bacteria help digestion."

Similar presentations


Ads by Google