1.

Gastric juice contains about 3.0 g of HCl per litre. If a person produces about 2.5 litre of gastric juice per day, how may antacid tablets each containing 400 mg of Al(OH)_(3) are needed to neutralize all the HCl produced in one day.

Answer»

Solution :HCl is neutralized by `Al(OH)_(3)` according to the EQUATION,
`UNDERSET(27+3xx17=78g)(Al(OH)_(3))+underset(3xx36.5=109.5g)(3HCl)rarrAlCl_(3)+3H_(2)O`
HCl produced from 2.5 litre of gastric juice `=3.0xx2.5=7.5g`
109.5 g HCl is neutralized by `Al(OH)_(3)=78g`
`THEREFORE"7.5 g HCl will be neutralized by "Al(OH)_(3)=(78)/(109.5)xx7.5g=5.342g=5342mg`
`therefore"Number of tablets required "=(5342)/(400)=13.35, " i.e., 14 tablets."`


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