Chemistry160-page14

Chemistry160-page14 - -7 ) of a volume of water will be: H...

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Chemistry Concepts - 14 Some special properties of water: Acids, Bases, Salts and Buffers Recall that ionic bonds dissociate in solution forming ions, but covalent compounds resist dissociation. This is essentially true. However, some polar covalent compounds, including water, do dissociate, and it is important to discuss the meaning of this as it relates to living organisms, and their chemical environment. A molecule of water is formed by the bonding of 1 oxygen with 2 hydrogen atoms. Oxygen has a very high electronegativity so that water is very polar, so polar that at any given instant, the attraction of the oxygen atom for electrons will literally draw an electron away from a hydrogen, or in fact, the water molecule ionizes. At any time, a fixed proportion (specifically 10
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Unformatted text preview: -7 ) of a volume of water will be: H + (Hydrogen ions) OH-(Hydroxide ions) and the rest of the water will be: H 2 O (Water molecules) This phenomenon of water dissociation has bearing on a whole class of substances which contain hydrogen or hydroxide ions: Acids and Bases, Plus Salts. Acid A substance which liberates H + in solution Base or alkaline substance A substance which combines with H + in solution A substance which donates OH-to solution Salt An ionic compound which can be formed which an acid and base react. (Water is also formed along with the salt.) Salts dissociate into ions in solution. Many minerals needed for living organisms are salts. Some examples: Ca ++ Fe ++ or Fe +++ K + Na + Cl-...
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This note was uploaded on 12/29/2011 for the course BIO 151 taught by Professor Edwards during the Spring '10 term at SUNY Stony Brook.

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