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| Summary |
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 Hydrochloric acid is present in the gastric juice of all mammals and in certain volcanic gases. |
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Hydrogen chloride gas is prepared by the direct combination of hydrogen and chlorine in presence of sunlight. |
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HCl gas turns blue litmus red, forms white precipitate of silver chloride with silver nitrate solution. |
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Hydrochloric acid is prepared by dissolving HCl gas in water. |
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Hydrochloric acid ionizes to form hydrogen ions and chloride ions in water. |
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Hydrochloric acid turns blue litmus red, methyl orange from yellow to pink and phenolphthalein (alkaline) from pink to colorless. |
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Hydrochloric acid reacts with metals like Mg, Zn, Fe to form respective chlorides liberating hydrogen. |
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Hydrochloric acid can be tested with silver nitrate solution where it gives white precipitate of silver chloride or with lead nitrate solution where it gives white precipitate of lead chloride. |
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Hydrochloric acid is used in the production of dyes, drugs, paints, photographic chemicals and in the preparation of aqua-regia for dissolving metals like gold and platinum. |
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