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Acidic and basic solutions
Chemical reaction between iron and hydrochloric acid
The purpose is to study the chemical reaction between iron and hydrochloric acid.
We use:
- Iron powder (Iron powder is more reactive than compact iron )
- A hydrochloric acid solution.
- A test tube which allows a better observation.
Reaction between iron and
hydrochloric acid:
We observe the formation of bubbles which indicate that a gas forms
To understand this chemical reaction we must identify the gaz, and analyze the composition of the aqueous solution in order to check a possible change.
Analysis of the gas:
The test for hydrogen gas is positive. This reaction therefore produces dihydrogen.
Analysis of the resulting solution:
- A measurement of pH shows that the latter increased: the solution is less acidic, hydrogen ions therefore have been consumed.
- The addition of silver nitrate leads to the formation of a white precipitate which indicates that the chloride ions are still in solution.
- The test for iron (II) ions is positive: Iron (II) ions (Fe 2+) have formed.
- The reactants are substances initially gathered: iron and hydrochloric acid.
- Products are substances that have formed: dihydrogen and iron (II) ions that form with chloride ions a solution of Iron(II) chloride
Simple word equation:
| iron + hydrochloric acid | → | dihydrogen + Iron(II) chloride |
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