Will BeSO4 or BaSO4 be more likely to be a. a good desiccant, or b. crystallize as a hydrate?

Name: Problem 16, Chapter 3: Principles of Descriptive Inorganic Chemistry
Uploaded: 2023-03-13T14:52:40-08:00
Duration: 1 min 8 s
Channel: Anand Jangid
Description: Will BeSO4 or BaSO4 be more likely to be a. a good desiccant, or b. crystallize as a hydrate?

step 1 So here in this question, the compound, the compound B .E .S .O4, B .E .S .O4 .O., which means i

Will BeSO4 or BaSO4 be more likely to be a. a good...

Key Concepts

Hygroscopicity and Desiccant Properties

A good desiccant is a substance that readily absorbs moisture from its surroundings but remains anhydrous in its application. This property largely depends on a compound’s affinity for water and its ability to bind water vapor without undergoing irreversible structural change or dissolving. In designing drying agents, one seeks a material that will attract and sequester water without forming a stable, hydrated lattice that would compromise its drying function.

Hydrate Formation

Crystallization as a hydrate occurs when a salt readily incorporates water molecules into its crystal lattice, a tendency that is dictated by the balance of lattice energy and hydration energy. When the hydration energy—typically higher for small, high?charge-density cations—is sufficient to overcome the lattice energy of the anhydrous salt, the compound tends to form hydrates from the environment.

Ionic Size and Polarizing Power

The size and polarizing power of the metal cation strongly influence both the hydration energy and the tendency to form hydrates. Small, highly charged cations, due to their high charge density, can attract water molecules strongly and promote hydrate formation. In contrast, larger cations with lower charge density are less effective at polarizing water molecules, often resulting in lower hydration energies and a decreased tendency to form hydrates.

Lattice Energy and Solubility

Lattice energy, which is affected by the sizes and charges of the ions, determines how tightly the ions are held together in the solid state. A salt with a high lattice energy might be less likely to dissolve or react with water, and its solubility can influence whether it can incorporate water as a hydrate or remain inert. This balance is essential in determining whether a compound will serve as an effective desiccant or preferentially crystallize as a hydrate.

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