Question

Gastric juice contains 3.0 g of HCl per litre. If a person produces 2.5 L of gastric juices per day, then the amount of antacid tablets each containing 400 mg of Al(OH 3 ​ ) needed to neutralize all the HCl produced in one day is :

Answer 1

Answer:

The molar masses of HCl and Al(OH)

3

are 36.5 g/mol and 78 g/mol respectively.

In one day, a person produces 2.5 L of gastric juices which contain 2.5×3.0=7.5g of HCl.. This corresponds to

36.5

7.5

=0.20 moles of HCl.

1 mole of Al(OH)

3

will neutralize 3 moles of HCl.

Hence, 0.2 moles of HCl will be neutralized by

3

0.2

=0.068 moles of Al(OH)

3

. This corresponds to 0.068×78=5.34 g of Al(OH)

3

Each antacid tablet contains 400 mg or 0.4 g of Al(OH)

3

. hence, the number of antacid tablet required per day to neutralize HCl are

0.4

5.34

≈14.

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