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Give reason why nitric acid cannot be used to obtain hydrogen gas from metals |
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Answer» Nitric acid is strong oxidising agent . It oxidises the hydrogen formed by water. ... Actually the main thing is Nitric acid is strong oxidising agent . It oxidises the hydrogen formed by water. -As we know that nitric acid has another name that is aqua fortis which is a highly corrosive acid. The molecular formula of nitric acid consists of one hydrogen, one nitrogen and 3 oxygen molecules.-Also, nitric acid is also a strong oxidising agent because it can oxidise other molecules by giving an oxygen molecule and reduces itself.-Now, we know that hydrogen gas consists of two atoms of hydrogen which combine when metal and water react together.-Metals such as sodium, magnesium, manganese, etc can be used to react with a cheap compound that is water to liberate the hydrogen gas.-The balanced chemical reaction is:2Na + 2H2O → 2NaOH + 2H2-But if we use the dilute nitric acid then it will act as an oxidising agent and react with hydrogen gas to produce water molecules.-As we can see in the chemical reaction:2HNO3 + H2 → 2H2O + 2NO2Therefore, due to the oxidation of hydrogen gas by dilute nitric acid, nitric acid is not used forthe preparation of hydrogen gas. |
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