Describe how to prepare BaSO, barium sulfate, by (a) a...

Describe how to prepare BaSO, barium sulfate, by (a) a precipitation reaction and (b) a gas-forming reaction. The available starting materials are $\mathrm{BaCl}_{2}, \mathrm{Ba} \mathrm{CO}_{3}$ $\mathrm{Ba}(\mathrm{OH})_{2}, \mathrm{H}_{2} \mathrm{SO}_{4},$ and $\mathrm{Na}_{2} \mathrm{SO}_{4} .$ Write complete, balanced equations for the reactions chosen. (See page 113 for an illustration of the preparation of the compound.)

Describe how to prepare BaSO, barium sulfate, by (a) a precipitation reaction and (b) a gas-forming reaction. The available starting materials are $\mathrm{BaCl}_{2}, \mathrm{Ba} \mathrm{CO}_{3}$ $\mathrm{Ba}(\mathrm{OH})_{2}, \mathrm{H}_{2} \mathrm{SO}_{4},$ and $\mathrm{Na}_{2} \mathrm{SO}_{4} .$ Write complete, balanced
equations for the reactions chosen. (See page 113 for an illustration of the preparation of the compound.)

Key Concepts

Precipitation Reaction

A precipitation reaction involves mixing two aqueous solutions such that an insoluble salt (the precipitate) forms due to the low solubility of one of the products. This reaction typically follows a double displacement mechanism where the cations and anions exchange partners, and the resulting insoluble compound comes out of solution, making it a vital tool in both analysis and synthesis.

Gas-forming Reaction

A gas-forming reaction is a chemical process that produces a gaseous product as one of its outcomes. Such reactions are often utilized in syntheses where the evolution of a gas, like carbon dioxide in acid-carbonate reactions, drives the reaction forward or facilitates the isolation of the desired solid product.

Solubility Principles

Understanding solubility is crucial when predicting whether a compound will remain in solution or precipitate out. Solubility rules help determine if a particular combination of ions will yield an insoluble salt, a concept that is central to designing both precipitation and gas-forming reactions.

Acid–Carbonate Reaction Mechanism

The acid–carbonate reaction mechanism outlines how carbonates react with acids to produce carbon dioxide gas, water, and a salt. This type of reaction is a key example of a gas-forming process and illustrates the interplay between acid-base and decomposition chemistry, which can be exploited to produce specific compounds.