Multiple Choice
Which of the following best defines an acid?
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17. Acid and Base Equilibrium
Acids Introduction
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In a general-chemistry context, what is stomach acid primarily made of?
A
Aqueous hydrochloric acid, (hydrogen chloride dissolved in water)
B
Aqueous sulfuric acid,
C
Aqueous sodium hydroxide,
D
Aqueous acetic acid,
Verified step by step guidance1
Understand that stomach acid is a solution found in the stomach that helps digest food by breaking down proteins and killing harmful bacteria.
Recall that stomach acid is primarily composed of a strong acid dissolved in water, which creates a highly acidic environment with a low pH (around 1 to 2).
Identify the common strong acids: hydrochloric acid (HCl), sulfuric acid (H2SO4), and acetic acid (CH3COOH), and also consider bases like sodium hydroxide (NaOH).
Recognize that the acid in the stomach is specifically hydrochloric acid (HCl) dissolved in water, known as aqueous hydrochloric acid, which is secreted by parietal cells in the stomach lining.
Conclude that the correct chemical composition of stomach acid is aqueous hydrochloric acid, not sulfuric acid, sodium hydroxide, or acetic acid.
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