Question

which compound plays an important role in leather processing and electroplating?

nitric acid
hydrochloric acid
ammonia
magnesium hydroxide

Explanation:

Identify the question requirements

The question asks to identify which chemical compound is important in leather processing and electroplating.

Analyze the options

• Nitric acid (\(\text{HNO}_3\)): Primarily used in fertilizers, explosives, and rocket propellants.
• Hydrochloric acid (\(\text{HCl}\)): Widely used in the pickling of steel, leather processing (to adjust pH during tanning), and electroplating (to clean metal surfaces before plating).
• Ammonia (\(\text{NH}_3\)): Used mainly in fertilizers, cleaning products, and refrigeration.
• Magnesium hydroxide (\(\text{Mg(OH)}_2\)): Used as an antacid or laxative, and in wastewater treatment.

Determine the correct compound

Hydrochloric acid is the standard industrial chemical used to prepare metals for electroplating by removing rust or scale, and it is crucial in the leather industry for pickling hides.

Answer:

• nitric acid
• hydrochloric acid (Correct answer)
• ammonia
• magnesium hydroxide