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pH and Indicators

pH and Indicators. Chemistry Mrs. Coyle. Basic 14>ph>7. Neutral ph=7. Acidic 1<pH<7. Self Ionization of H 2 O. H 2 O  H + (aq) + OH - (aq) Ion Product Constant K w for Water: K w = [H + ] x [OH - ] =1.0 x 10 -14. For pure H 2 O.

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pH and Indicators

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  1. pH and Indicators Chemistry Mrs. Coyle

  2. Basic14>ph>7 Neutral ph=7 Acidic 1<pH<7

  3. Self Ionization of H2O H2O  H+ (aq) + OH- (aq) Ion Product ConstantK wfor Water: Kw= [H+ ] x [OH-] =1.0 x 10 -14

  4. For pure H2O [H+ ] = [OH-] = 1.0 x 10-7M

  5. pH • 1909 Soren Sorensen (Danish) pH=-log[H+] What is the pH of pure water?

  6. Ex 1: Find the pH for [H+]=10-3M • Answer: pH=3

  7. Ex 2: Find the pH for [H+]=5x10-3M • Answer: pH=2.3

  8. Finding [H+] from pH • [H+]= 10-pH

  9. Ex 3: Find the [H+] for pH=5 • Answer: [H+] = 10-5 M

  10. Ex 4: Find the [H+] for pH=5.8 • [H+]= 10-pH • Answer: [H+] = 1.6x10-6 M

  11. pOH pH=-log[H+] pH + pOH=14

  12. Basic(Alkaline)Solutions Neutral Solutions Acidic Solutions

  13. Acids Change phenolphthalein to colorless.

  14. Acids • Turn litmus paper from blue to red.

  15. Bases Change phenolphthalein to pink.

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