TopIc: pH and IndIcators

TopIc: pH and IndIcators

• 1. TopIc:pH and IndIcators TopIc:pH and IndIcators
• 2. Ph Scale Power (Or Potential) Of HydrogenRanges From 0-14Measures H+ Concentration [H+]The More H+, The More Acidic The Solution Ph Scale Power (Or Potential) Of Hydrogen Ranges From 0-14 Measures H+ Concentration [H+] The More H+, The More Acidic The Solution
• 3. AcId, Base, or Neutral  AcId, Base, or Neutral •Neutral solution: pH = 7 •Acidic solution: pH LESS THEN 7 •Basic solution: pH GREATER THEN 7 H+1 > OH-1 OH-1 > H+1 [H+] = [OH-]
• 4. AcId, Base, or Neutral  AcId, Base, or Neutral
• 5. How to safely test pH How to safely test pH •NEVER “Taste” •Instruments – Use A Ph Meter •See If The Substance Reacts With A Metal Other Than Cu, Ag, Or Au •Indicators – Use A Series Of Indicators
• 6. IndIcator IndIcator substance that changes color over narrow pH range
• 7. What Color Would The Following Indicators Be In A Neutral Solution? What Color Would The Following Indicators Be In A Neutral Solution? yellow green colorless purple blue yellow
• 8. Use Several Indicators To Narrow Down Ph Range Of Substance Use Several Indicators To Narrow Down Ph Range Of Substance Ex: Three samples of the same solution are tested, each with a different indicator. All three indicators, bromthymol blue, bromcresol green and thymol blue, appear blue The pH of the solution must be greater than
• 9. Use Several Indicators To Narrow Down Ph Range Of Substance Use Several Indicators To Narrow Down Ph Range Of Substance
• 10. Practice Using Table M1. What Indicator Is Yellow With A Ph 9.82. Which Indictor Is Blue With A Ph Of 5.6 Practice Using Table M 1. What Indicator Is Yellow With A Ph 9.8 2. Which Indictor Is Blue With A Ph Of 5.6