bio 202 exam 1 study guide(5)

bio 202 exam 1 study guide(5) - 8 Acids and Bases Water is...

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8. Acids and Bases Water is in a state of dynamic equilibrium in which water molecules dissociate at the same rate at which they are being reformed. Though statistically rare, the dissociation of water molecules has a great effect on organisms. The concentration of each ion in pure water is 10^-7M (25C). 1 molecule of water Out of 554 million is dissociated. Changes in concentrations of H+ and OH- can drastically affect the chemistry of a cell. A. What makes a solution acidic or basic? a. Hydrogen and hydroxide ion concentrations in pure water are the same, 10^-7M. the product of these is 10^-14 molar. b. remains constant- if concentration of hydrogen ions increases, concentration of hydroxide ions must decrease. c. amount of change in ion concentrations is typically determined by concentration of hydrogen ions; described as the acidity of an aqueous solution i. acidic solution: higher concentration of hydrogen ions (>10^-7) ii. basic solution: lower concentration of hydrogen ions (<10^-7) a solution in which the concentration of H+ is equal to that of OH- is defined as neutral.
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  • Spring '08
  • dean
  • Biology, pH, Acid rain, hydrogen ions, H+ concentration

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