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Pure water is composed of two hydrogen molecules and one oxygen molecule, thus the formula H20.
Outside of a lab, it is quite unlikely that you will encounter pure water.
Dec. 17,2011
Water molecule consists of two hydrogen atoms and one oxygen atom.
Hard water is not pure water. It contains ions such as calcium ions and magnesium ions. calcium ions cause permanent hardness whereas, magnesium ions cause temporary hardness.
True, outside of a lab, natural water will always contain some chemical species, ions or undissolved microscopic materials that are not visible to the naked eye.
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