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Lecture 2

BIOL 1543 Lecture 2: chemistry

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BIOL 1543
John Chadwick

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12916 Lecture Chemistry of life is sensitive to acidic and basic conditions In liquid water a small of water molecules break apart into ions Very sensitive: Some hydrogen ions (H+) Some hydroxide ions (OH) Acids and Bases Acid: a substance that donates hydrogen ions to solutions More H+ in water Base: a substance that reduces hydrogen ion concentration of a solution Less H+ more OH in water PH scale: describes how acidicbasic a solution is Measure of concentration of H+ Ranges from 014 (0=most acidic, 14=most basic) Each pH unit represents a 10fold change in concentration of H+ in a solution
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