Lorsqu'on mélange une solution de nitrate d'argent AgNO3 et une solution de chromate de potassiu

step 1 So let's start by finding the concentration of some ions, and then we can find the missing conce

Lorsqu'on mélange une solution de nitrate d'argent AgNO3 et...

Lorsqu'on mélange une solution de nitrate d'argent $\mathrm{AgNO}_3$ et une solution de chromate de potassium $\mathrm{K}_2 \mathrm{CrO}_4$, on obtient un précipité rouge de chromate d'argent $\mathrm{Ag}_2 \mathrm{CrO}_4$. a) Quelle est la masse du précipité obtenu en mélangeant $125 \mathrm{~mL}$ de nitrate d'argent à 35,0 g.L ${ }^{-1}$ et $105 \mathrm{~mL}$ de chromate de potassium à 18,0 g.L ${ }^{-1}$ ? b) Quel volume minimal de cette solution de chromate faudrait-il ajouter à $125 \mathrm{~mL}$ de la solution de nitrate d'argent pour précipiter totalement les ions $\mathrm{Ag}^{+}$?

Lorsqu'on mélange une solution de nitrate d'argent $\mathrm{AgNO}_3$ et une solution de chromate de potassium $\mathrm{K}_2 \mathrm{CrO}_4$, on obtient un précipité rouge de chromate d'argent $\mathrm{Ag}_2 \mathrm{CrO}_4$.
a) Quelle est la masse du précipité obtenu en mélangeant $125 \mathrm{~mL}$ de nitrate d'argent à 35,0 g.L ${ }^{-1}$ et $105 \mathrm{~mL}$ de chromate de potassium à 18,0 g.L ${ }^{-1}$ ?
b) Quel volume minimal de cette solution de chromate faudrait-il ajouter à $125 \mathrm{~mL}$ de la solution de nitrate d'argent pour précipiter totalement les ions $\mathrm{Ag}^{+}$?

Key Concepts

Mass-Mole Conversions

Mass-mole conversions are required to translate between the mass of substances and their amount in moles using the molar mass. This conversion is fundamental in stoichiometric calculations, allowing one to determine the mass of a precipitate based on the number of moles that react according to the balanced chemical equation.

Concentration and Volume Relationships

This concept involves using solution concentration (given in mass per unit volume or moles per liter) to determine the number of moles of solute present based on the volume of the solution. Understanding these relationships is essential when calculating the amount of reactants available for a reaction and for adjusting volumes to achieve complete reactions.

Limiting Reagent

The limiting reagent is the reactant that is completely consumed during the chemical reaction, thus limiting the amount of product formed. Identifying the limiting reagent is critical in predicting the maximum yield of a desired product and for performing accurate stoichiometric calculations in reactions involving mixed solutions.

Chemical Stoichiometry

Chemical stoichiometry deals with the quantitative relationships between the reactants and products in a chemical reaction. This includes using balanced chemical equations to determine the proportion of reactants that combine and the amounts of products produced. It is essential for calculating limiting reagents, reacting volumes, and yielded masses in reactions.

Precipitation Reaction

This concept involves the formation of an insoluble compound when two solutions containing ions are mixed. In such reactions, ions combine to create a product that does not dissolve in the solvent, forming a precipitate. Understanding precipitation reactions is crucial for predicting the products and calculating quantities like the mass of the precipitate formed.

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