Monday, December 18, 2017

THE UNIVERSAL SOLVENT - Water is called the universal solvent because more substances dissolve in water than in any other chemical. The hydrogen side of each water (H2O) molecule carries a slight positive electric charge, while the oxygen side carries a slight negative electric charge. This helps water dissociate ionic compounds into their positive and negative ions. The positive part of an ionic compound is attracted to the oxygen side of water while the negative portion of the compound is attracted to the hydrogen side of the water.

The Universal Solvent
Water is valued as a solvent in part because
so many types of molecules will dissolve in it
.
Why Is Water the Universal 
Solvent?
Why water dissolves so many different chemicals
by Anne Marie Helmenstine, Ph.D.
Water is known as the universal solvent.
Here is an explanation of why water is called the universal solvent and what properties make it good at dissolving other substances.

Chemistry Makes Water A Great Solvent

Water is called the universal solvent because more substances dissolve in water than in any other chemical.
This has to do with the polarity of each water molecule.
The hydrogen side of each water (H2O) molecule carries a slight positive electric charge, while the oxygen side carries a slight negative electric charge.
This helps water dissociate ionic compounds into their positive and negative ions.
The positive part of an ionic compound is attracted to the oxygen side of water while the negative portion of the compound is attracted to the hydrogen side of the water.

Why Salt Dissolves in Water

For example, consider what happens when salt dissolves in water.
Salt is sodium chloride, NaCl. The sodium portion of the compounds carries a positive charge, while the chlorine part carries a negative charge.
The two ions are connected by an ionic bond. The hydrogen and oxygen in the water, on the other hand, are connected by covalent bonds.
Hydrogen and oxygen atoms from different water molecules are also connected via hydrogen bonds.
When salt is mixed with water, the water molecules orient so that the negative charge oxygen anions faces the sodium ion, while the positive-charged hydrogen cations face the chloride ion.
Although ionic bonds are strong, the net effect of the polarity of all the water molecules is enough to pull the sodium and chlorine atoms apart.
Once the salt is pulled apart, its ions become evenly distributed, forming a homogeneous solution.
If a lot of salt is mixed with water, it won't all dissolve.
In this situation, dissolution proceeds until there are too many sodium and chlorine ions in the mixture for water to win the tug-of-water with undissolved salt.
Basically, the ions get in the way and prevent the water molecules from completely surrounding the sodium chloride compound.
Raising the temperature increases the kinetic energy of the particles, increasing the amount of salt that can be dissolved in the water.

Water Doesn't Dissolve Everything

Despite its name as the "universal solvent" there are many compounds water won't dissolve or won't dissolve well.
If the attraction is high between the opposite charged ions in a compound, then the solubility will be low. For example, most of the hydroxide exhibit low solubility in water.
Also, non-polar molecules don't dissolve very well in water, including many organic compounds, such as fats and waxes.
In summary, water is called the universal solvent because it dissolves the most substances, not because it actually dissolves every single compound.


Anne Marie Helmenstine, Ph.D. is an author and consultant with a broad scientific and medical background.
Experience
Anne has taught chemistry, biology, and physics at the high school, college, and graduate level. In her doctoral work, Anne developed ultra-sensitive chemical detection and medical diagnostic tests. She has worked abstracting/indexing diverse scientific literature for the Department of Energy. She presently works as a freelance writer and scientific consultant. She enjoys adapting lab-based science projects so that they can be performed safely at home.
Education
Dr. Helmenstine has bachelor of arts degrees in physics and mathematics with a minor in chemistry from Hastings College in Nebraska and a doctorate of philosophy in biomedical sciences from the University of Tennessee at Knoxville.
Chemistry is part of everyone's life, from cooking and cleaning to the latest computer chip technology and vaccine development. It doesn't have to be intimidating and it doesn't have to be hard to understand.
You can read more about Anne's current and past work on her Google Profile: Anne Helmenstine. Find Anne's printable periodic tables and science projects at Science Notes.
https://www.thoughtco.com/why-is-water-the-universal-solvent-609417
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