Emergency Management. Survey Manual. Learn why water's chemical composition and physical attributes make it such an excellent solvent. Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the "universal solvent" because it dissolves more substances than any other liquid.
This is important to every living thing on earth. It means that wherever water goes, either through the ground or through our bodies, it takes along valuable chemicals, minerals, and nutrients. Anne Marie Helmenstine, Ph. Chemistry Expert. Helmenstine holds a Ph.
She has taught science courses at the high school, college, and graduate levels. Facebook Facebook Twitter Twitter. Updated September 09, Featured Video.
Cite this Article Format. Helmenstine, Anne Marie, Ph. Why Is Water the Universal Solvent? Properties of Ionic and Covalent Compounds. Covalent or Molecular Compound Properties. Ionic vs Covalent Bonds - Understand the Difference. What Is a Universal Solvent in Chemistry? How to Separate Salt and Sand — 3 Methods. Molecular Formula for Common Chemicals. Your Privacy Rights.
To change or withdraw your consent choices for ThoughtCo. At any time, you can update your settings through the "EU Privacy" link at the bottom of any page. These choices will be signaled globally to our partners and will not affect browsing data. This is important to every living thing on earth. It means that wherever water goes, either through the air, the ground, or through our bodies, it takes along valuable chemicals, minerals, and nutrients.
It is water's chemical composition and physical attributes that make it such an excellent solvent. Water molecules have a polar arrangement of oxygen and hydrogen atoms—one side hydrogen has a positive electrical charge and the other side oxygen had a negative charge. This allows the water molecule to become attracted to many other different types of molecules. Water can become so heavily attracted to a different compound, like salt NaCl , that it can disrupt the attractive forces that hold the sodium and chloride in the salt compound together and, thus, dissolve it.
Our own kidneys and water's solvent properties make a great pair in keeping us alive and healthy. The kidneys are responsible for filtering out substances that enter our bodies from the foods and drinks we consume. But, the kidneys have got to get rid of these substances after they accumulate them. That is where water helps out; being such a great solvent, water washing through the kidneys dissolves these substances and sends them on the way out of our bodies.
This diagram shows the positive and negative parts of a water molecule. It also depicts how a charge, such as on an ion Na or Cl, for example can interact with a water molecule. At the molecular level, salt dissolves in water due to electrical charges and due to the fact that both water and salt compounds are polar, with positive and negative charges on opposite sides in the molecule.
The bonds in salt compounds are called ionic because they both have an electrical charge—the chloride ion is negatively charged and the sodium ion is positively charged. Likewise, a water molecule is ionic in nature, but the bond is called covalent, with two hydrogen atoms both situating themselves with their positive charge on one side of the oxygen atom, which has a negative charge.
When salt is mixed with water, the salt dissolves because the covalent bonds of water are stronger than the ionic bonds in the salt molecules. The positively-charged side of the water molecules are attracted to the negatively-charged chloride ions and the negatively-charged side of the water molecules are attracted to the positively-charged sodium ions.
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