Un précipité de chlorure d'argent AgCl peut être redissous par addition d'ammoniac dans la solut

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Un précipité de chlorure d'argent AgCl peut être redissous...

Un précipité de chlorure d'argent $\mathrm{AgCl}$ peut être redissous par addition d'ammoniac dans la solution où il se trouve.
Quelle quantité d'ammoniac faut-il pour dissoudre $4,27 \mathrm{~g}$ de chlorure d'argent, placé en suspension dans $500 \mathrm{~mL}$ d'eau ?

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Key Concepts

Stoichiometry

Stoichiometry refers to the quantitative relationships between the reactants and products in a chemical reaction. It involves using mole ratios derived from the balanced chemical equation to calculate the necessary amounts of substances required for the reaction.

Precipitation Reactions

Precipitation reactions involve the formation of an insoluble solid, known as a precipitate, when two solutions combine. The process depends on the solubility rules of the compounds involved and is key to separating or removing particular ions from a solution.

Complex Ion Formation

Complex ion formation is a process in which central metal ions bind to one or more molecules or ions (ligands) to form a coordination complex. This formation can increase the solubility of otherwise insoluble compounds, as seen when a precipitate dissolves upon the addition of a ligand.

Solubility Equilibria

Solubility equilibria describe the balance between a solid phase and its ions in solution. Shifting this equilibrium, through changes such as the addition of a complexing agent, can lead to the dissolution of a precipitate by forming more soluble complex ions.

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