Water is a chemical compound, a solvent and, a polar molecule. Its chemical formula H2O. meaning every water molecule is made up of 2 hydrogen atoms and 1 oxygen atom. It is a green solvent because it is natural and there is a lot of water on earth. 70% of the Earth's surface is covered by it.
Water is a good green solvent because of its polarity which simply means equal bonding electrons are shared between atoms.When a polar compound enters the water the water molecules surrounds the compound. A polar compound could be salt (sodium chloride). In water the compound separates and each element is surrounded by water molecules. The ions then are easily move away from the crystal structure into the solution/water.
http://www.worldofmolecules.com/solvents/water.htm
http://www.teachersdomain.org/asset/lsps07_int_dissolvesalt/
So if you were to do a experiment to observe how salt crystals are form. Water is a green solvent that can be used. It can also be a green solvent in other experiments observing how different compounds dissolve. For example compounds like calcium choloride, sodium hydroxide, or sucrose.
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