Gastric juice contains about 3.0 g of HCl per litre. If a person produces about 2.5litre of gastric juice per day, how many antacid tablets each containing 400 mg of Al(OH)3 are needed to neutralize all the HCl produced in one day.
HCl is neutralized by Al(OH)3 according to the equation
Al(OH)3 + 3 HCl → AlCl3 + 3 H2O
= 78 g = 109.5 g
HCl produced from 2.5 lire of gastric juice
109.5 g HCl is neutralized by Al(OH)3 = 78 g
= 5.342 g
= 5342 mg
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