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Understanding pH

Understanding pH. Sources: 1. Anthony Carpi, Acids, Bases and pH, http://web.jjay.cuny.edu/~acarpi/NSC/7-ph.htm , 1998-1999 2. Paul Decelles, The pH Scale, http://staff.jccc.net/pdecell/chemistry/phscale.html , 6/20/2002. Water Molecule. H 2 O. H 2 O. H 2 O. Proton Exchange. H 2 O.

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Understanding pH

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  1. Understanding pH Sources: 1. Anthony Carpi, Acids, Bases and pH, http://web.jjay.cuny.edu/~acarpi/NSC/7-ph.htm, 1998-1999 2. Paul Decelles, The pH Scale, http://staff.jccc.net/pdecell/chemistry/phscale.html, 6/20/2002

  2. Water Molecule H2O

  3. H2O H2O

  4. Proton Exchange H2O HO- Hydroxide H2O H3O+Hydronium

  5. Proton Exchange H2O HO-Hydroxide H3O+Hydronium H2O

  6. High concentration of OH- Low concentration of H3O+ Base

  7. High concentration of H3O+ Low concentration of OH- Acid

  8. Acid Base Neutral

  9. Examples - log (1 x 10-3 ) = 3 What is pH?pH isthe oppositeof the logof the concentrationof Hydronium ions measured in moles per literorpH = - log (concentration H3O+ ) - log (1 x 10-7 ) = 7 - log (1 x 10-11 ) = 11

  10. How much more acidic is orange juice than coffee?The answer is the ratio of the concentrations of H3O+. Orange juice Coffee OJ is 100 times as acidic as coffee.This also implies that coffee is 100 times as basic as OJ.

  11. Understanding pH Sources: 1. Anthony Carpi, Acids, Bases and pH, http://web.jjay.cuny.edu/~acarpi/NSC/7-ph.htm, 1998-1999 2. Paul Decelles, The pH Scale, http://staff.jccc.net/pdecell/chemistry/phscale.html, 6/20/2002

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