2 p h and indicators

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2 p h and indicators

  1. 1. pH and Indicators Chemistry Mrs. Coyle
  2. 2. Basic 14>ph>7 Neutral ph=7 Acidic 1<pH<7
  3. 3. Self Ionization of H2O H2O  H+ (aq) + OH- (aq) Ion Product Constant K w for Water: Kw= [H+ ] x [OH- ] =1.0 x 10 -14
  4. 4. For pure H2O [H+ ] = [OH- ] = 1.0 x 10-7 M
  5. 5. pH • 1909 Soren Sorensen (Danish) pH=-log[H+ ] What is the pH of pure water?
  6. 6. Ex 1: Find the pH for [H+ ]=10-3 M • Answer: pH=3
  7. 7. Ex 2: Find the pH for [H+ ]=5x10-3 M • Answer: pH=2.3
  8. 8. Finding [H+ ] from pH • [H+ ]= 10-pH
  9. 9. Ex 3: Find the [H+ ] for pH=5 • Answer: [H+ ] = 10-5 M
  10. 10. Ex 4: Find the [H+ ] for pH=5.8 • [H+ ]= 10-pH • Answer: [H+ ] = 1.6x10-6 M
  11. 11. pOH pH=-log[H+ ] pH + pOH=14
  12. 12. Basic(Alkaline) Solutions Acidic Solutions Neutral Solutions
  13. 13. Acids Change phenolphthalein to colorless.
  14. 14. Acids • Turn litmus paper from blue to red.
  15. 15. Bases Change phenolphthalein to pink.

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