EVPP 110 Lecture - Matter and Energy - pH Chemical Reactions Thermodynamics - Student - Fall 2010

EVPP 110 Lecture - Matter and Energy - pH Chemical Reactions Thermodynamics - Student - Fall 2010

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Unformatted text preview: pH H Chemical reactions H Thermodynamics H Enzymes Hydrogen ion (H + ) + Simplified View of dissociation of water into a hydrogen ion and an hydroxide ion Simplified view of dissociation of water molecule to a hydrogen ion and a hydroxide ion pH • Scale is logarithmic acid • Compound that donates H + to solutions – Solution in which [H+] > [OH-] – pH<7 base • Compound that accepts H + and removes them from solution – Solution in which [H + ] < [OH- ] Neutral – Solution in which [H + ] = [OH- ] – pH=7 – Buffers – Accept H + when excessive – Donate H + when depleted Environmental issues related to pH H Normal rainfall H pH ~ 5.6 • CO 2 is product of cellular respiration • CO 2 + H 2 O → H 2 CO 3 (carbonic acid) Environmental issues related to pH H Acid precipitation H pH <5.6 • Human activities, especially burning fossil fuels, generate • CO 2 + H 2 O → H 2 CO 3 (carbonic acid) • SO 2 + H 2 O → H 2 SO 4 (sulfuric acid) • NO x + H 2 O → HNO 3 (nitric acid) Environmental issues related to pH H Acid precipitation H Damages • Organisms Environmental issues related to pH H Acid precipitation H Damages • ecosystems Environmental issues related to pH H Acid precipitation H Damages • Ocean acidification Environmental issues related to pH H Acid precipitation H Damages • Cultural resources Acid rain damage to statuary in Germany, 1908 & 1968 Which of the following statements about pH is (are) true ? • A. pH is a measure of hydrogen ion concentration. • B. A single unit change on the pH scale represents an order of magnitude change in hydrogen ion concentration. • C. An increase in hydrogen ion concentration means a decrease in pH scale units. A solution with a pH of 2 is _____ whereas a solution with a pH of 13 is _______....
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This note was uploaded on 01/21/2011 for the course EVPP 110 taught by Professor All during the Winter '08 term at George Mason.

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EVPP 110 Lecture - Matter and Energy - pH Chemical Reactions Thermodynamics - Student - Fall 2010

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