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Study the scheme for dilute nitric acid.(i) Give the name or formula o(a) Solution A (b) Solution B(c) Acation in solution C(d) Solid D(ii) What property of nitric acid is shown by its reaction with iron (II) ions and aqueous potassium iodide solution ?(iii) Describe one other reaction of dilute nitric acid not shown in the reaction scheme, that is typical of a strong acid. |
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Answer» (i) (a) Copper (II) nitrate Cu(NO3)2 (b) Ammonium nitrate (c) Fe3+ (d) Iodine (ii) Oxidising property of nitric acid. (iii) It is a characteristic of strong acids that when dilute, they react with the more electropositive metals, liberating hydrogen gas Zn + 2H+ ⟶ Zn2+ + H2 This reaction can not occur with nitric acid as it is a powerful oxidising agent. Any hydrogen initially produced is at once oxidised by more of the acid to water. If however very dilute nitric acid is used (about 1%) with magnesium or manganese, some hydrogen will be produced, escaping oxidation because of the very dilute condition of the acid. Mg + 2HNO3 (very dil.) ⟶ Mg(NO3)2 + H2 |
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