L'addition d'acide sulfurique dans une solution de chlorure...

L'addition d'acide sulfurique dans une solution de chlorure de baryum provoque la précipitation de sulfate de baryum. 1) Écrire l'équation stœchiométrique de cette réaction. 2) Quel volume d'acide sulfurique à $0,5 \mathrm{~mol} . \mathrm{L}^{-1}$ faut-il ajouter à $50 \mathrm{~mL}$ d'une solution de $\mathrm{BaCl}_2$ à 0,05 mol. $\mathrm{L}^{-1}$ pour précipiter totalement les ions $\mathrm{Ba}^{2+}$ ?

L'addition d'acide sulfurique dans une solution de chlorure de baryum provoque la précipitation de sulfate de baryum.
1) Écrire l'équation stœchiométrique de cette réaction.
2) Quel volume d'acide sulfurique à $0,5 \mathrm{~mol} . \mathrm{L}^{-1}$ faut-il ajouter à $50 \mathrm{~mL}$ d'une solution de $\mathrm{BaCl}_2$ à 0,05 mol. $\mathrm{L}^{-1}$ pour précipiter totalement les ions $\mathrm{Ba}^{2+}$ ?

Key Concepts

Molarity and Concentration

Molarity is a measure of concentration expressed as moles of solute per liter of solution. It is a key concept for quantifying the amounts of chemicals in solution, and it plays a critical role in determining the volumes and moles needed for reaction calculations.

Limiting Reactant

The limiting reactant is the reactant that is entirely consumed first in a chemical reaction, thereby limiting the amount of product that can be formed. Identifying the limiting reactant is crucial for accurate stoichiometric calculations and for ensuring complete reactions, especially in precipitation scenarios.

Reaction Stoichiometry

Reaction stoichiometry involves writing and balancing chemical equations to reflect the conservation of mass and atoms in a chemical reaction. It ensures that the number of atoms for each element is the same on both sides of the equation and is essential for determining the relationships between reactants and products.

Precipitation Reaction

A precipitation reaction occurs when two aqueous solutions are mixed and an insoluble solid, the precipitate, is formed. Understanding precipitation reactions involves knowing solubility rules and predicting which combinations of ions will lead to the formation of an insoluble compound.