When hydrogen sulfide, H2 S, gas is bubbled through a solution of lead(II) nitrate, Pb(NO3)2, a

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When hydrogen sulfide, H2 S, gas is bubbled through a...

When hydrogen sulfide, $\mathrm{H}_{2} \mathrm{~S}$, gas is bubbled through a solution of lead(II) nitrate, $\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}$, a black precipitate of lead(II) sulfide, $\mathrm{PbS},$ forms, and nitric acid, $\mathrm{HNO}_{3},$ is produced. Write the unbalanced chemical equation for this reaction.

Key Concepts

Precipitation Reaction

A precipitation reaction is a type of chemical reaction in which two soluble compounds react to form one insoluble product, known as the precipitate. This process is governed by the solubility rules that predict which compounds will remain dissolved in solution and which will form a solid. Understanding precipitation reactions is essential for predicting the outcomes of mixing ionic solutions in aqueous environments.

Double Displacement Reaction

Double displacement (or metathesis) reactions occur when parts of two ionic compounds are exchanged, forming two new compounds. This type of reaction often involves the exchange of anions and cations between the reactants, and is a common mechanism underlying precipitation reactions, where one of the products is insoluble and precipitates out of solution.

Balancing Chemical Equations

Balancing chemical equations is the process of ensuring that the number of atoms for each element is the same on both sides of the reaction. This reflects the law of conservation of mass. It is a fundamental skill in chemistry that allows for the correct representation of the stoichiometry of a reaction, ensuring that the quantitative relationships between reactants and products are accurately depicted.

Solubility Rules

Solubility rules are guidelines that predict whether an ionic compound will dissolve in water. They help determine the formation of precipitates during chemical reactions by indicating which combinations of ions will produce insoluble compounds. Knowledge of solubility rules is crucial when analyzing reactions in aqueous solutions and determining the products of double displacement reactions.

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