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Difference Between Hydrated Salt and Anhydrous Salt

June 17, 2018Posted byMadhu

Thekey differencebetween hydrated salt and anhydrous salt is that thehydrated salt molecules are attached to water molecules whereas the anhydrous salt molecules are not attached to any water molecules.If we heat hydrated salts, they emit water molecules as water vapor.

Salts are compounds containinganions and cationsin a crystalline form. A salt forms from the combination of the anion of anacidand the cation of a base. There are two forms of salts as hydrated salts and anhydrous salts. These compounds are different from each other according to the presence or absence of water molecules. We call these water molecules “water of crystallization”.

CONTENTS

1.Overview and Key Difference
2.What is Hydrated Salt
3.What is Anhydrous Salt
4.Side by Side Comparison – Hydrated Salt vs Anhydrous Salt in Tabular Form
5.Summary

What is Hydrated Salt?

水合盐盐化合物,有水molecules attached to the salt molecules. A particular salt compound contains a certain number of water molecules. We call these molecules “water of crystallization” because these salt compounds have water molecules incorporated into the crystallization structure of the salt. These water molecules chemically bind with the salt molecules. These water molecules cause the shape of the crystals.

Difference Between Hydrated Salt and Anhydrous Salt

Figure 01: Hydrated Copper Sulfate

These hydrated salts form when ionic solids crystallize from aqueous solutions. When we remove this water from the salt crystals, it becomes anhydrous. A common example of a hydrates salt is copper sulfate pentahydrate (CuSO4.5H2O). Therefore, if we heat this compound, it converts into anhydrous copper sulfate. That is because when heated, the water molecules evaporate.

What is Anhydrous Salt?

Anhydrous salts are compounds that have no water molecules attached to the salt molecules. We use this term mostly when water of crystallization removes from hydrated salts. Therefore, the term anhydrous refers to a dry salt.

Key Difference Between Hydrated Salt and Anhydrous Salt

Figure 02: Anhydrous Copper Sulfate Turns into Blue Color when Hydrated

For example, anhydrous sodium sulfate is free of water. Therefore, we can use it as a drying material because it can absorb water and converts into the hydrated form.

What is the Difference Between Hydrated Salt and Anhydrous Salt?

水合盐盐化合物,有水molecules attached to the salt molecules. These compounds contain water of crystallization. If we heat these compounds, they emit water molecules as water vapor. Anhydrous salts are compounds that have no water molecules attached to the salt molecules. These compounds have no water molecules in the salt crystals.

Difference Between Hydrated Salt and Anhydrous Salt in Tabular Form

Summary – Hydrated Salt vs Anhydrous Salt

Salt are derivatives of a combination of acids and bases. There are two forms of salts as hydrated salts and anhydrous salts. The difference between hydrated salt and anhydrous salt is that hydrated salt molecules are attached to water molecules whereas anhydrous salt molecules are not attached to any water molecules.

Reference:

1.“Hydrated Salts.” Transportation of Minerals in Plants.Available here
2. Helmenstine, Anne Marie, Ph.D. “Anhydrous Definition.” ThoughtCo, Jun. 13, 2018.Available here

Image Courtesy:

1.“Siran měďnaty 'By核能开发局řej Mangl——自己的工作,(出版ic Domain) viaCommons Wikimedia
2.’Hydrating-copper(II)-sulfate’By Benjah-bmm27 – Own work, (Public Domain) viaCommons Wikimedia

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Filed Under:Inorganic Chemistry

About the Author:Madhu

Madhu is a graduate in Biological Sciences with BSc (Honours) Degree and currently persuing a Masters Degree in Industrial and Environmental Chemistry. With a mind rooted firmly to basic principals of chemistry and passion for ever evolving field of industrial chemistry, she is keenly interested to be a true companion for those who seek knowledge in the subject of chemistry.

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