Question

calculate the amount of acid neutralised by an antacid that contains 250mg of aluminium hydroxide and 250mg of magnesium hydroxide.
pls reply pls.....​

Answer 1

Answer:

The acid of the gastric juice is hydrochloric acid (HCl). So the antacids would neutralize HCl of the gastric juice. Now the chemical reactions involved in this process of neutralization may be represented as Al(OH)3 + 3HCl =AlCl3 + 3H2O and Mg(OH)2 + 2HCl = MgCl2 + 2H2O. This means a molecule of aluminium hydroxide would neutralize 3 molecules of hydrochloric acid and a molecule of magnesium hydroxide would neutralize 2 molecules of hydrochloric acid. Now let us calculate the molecular weights of the compounds involved in these reactions. The molecular weights of Al(OH)3, Mg(OH)2 and HCl are 78, 58 and 36.5 respectively. In accordance with the above reactions 78 g of Al(OH)3 would neutralize 109.5 g of HCl and 58 g of Mg(OH)2 would neutralize 73 g of HCl which by simple process of arithmetic works out as 250 mg of aluminium hydroxide would neutralize 351 mg of HCl and 250 mg of magnesium hydroxide would neutralize 314.66 mg of HCl.

hope it helps