You think probable to the preparation of a sample for analysis.
The purpose is to prepare a sample solution for analysis.
Nitric acid: HNO3
Iron Oxide is Fe[2]O[3] and Nitric acid is HNO[3]
Nitric acid being an oxidizing reagent help the oxidation of Fe(II) to Fe(III).
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15M nitric acid (HNO3) is a concentrated acid. In a reaction between iron and concentrated nitric acid, iron (III) nitrate [Fe(NO3)3], nitrogen dioxide (NO2), and water (H2O) are produced. The balanced reaction is as follows: Fe + 6HNO3 --> Fe(NO3)3 + 3NO2 + 3H2O
H2SO4 + Fe = FeSO4 + H2
Sulfuric Acid Iron + Sulfuric Acid= Iron Sulfate + Hydrogen gas Fe + H2SO4 → FeSO4 + H2
Nitric acid + Iron ----> Iron(III) nitrate + Water + Nitrogen dioxide
Iron + Nitric acid ----> Iron(III) nitrate + Water + Nitrogen Dioxide Fe + HNO3 ----> Fe(NO3)3 + H2O + NO2 NOTE: Nitrogen dioxide will come out only if the acid is concentrated. If it is dilute, Nitrogen monoxide will be produced.
Phosphoric acid form complexes with Fe(III) lowering the potential of the Fe(III)-Fe(II) couple and offering a more exact end point.
Fe[C7H5O3]2+