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Understanding pH Indicators with LeChatelier’s Principle

Explore compounds whose color changes with pH, using LeChatelier's Principle to determine indicator colors in acidic and basic solutions. Calculate pH, pOH, [H+], [OH-] for strong acid/base mixtures.

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Understanding pH Indicators with LeChatelier’s Principle

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  1. color 1 color 2 • 3. measuring pH • indicators: compounds whose color depends on pH (indicators are also acid/base compounds) • HIn(aq)+H2O(l)In1-(aq)+H3O1+(aq) • Question: use LeChatelier’s Principle • What color is the indicator in acidic sol’n? (color 1 or color 2) • What color is the indicator in basic sol’n? (color 1 or color 2) Chapter 15 Notes

  2. figure 15.4 Chapter 15 Notes

  3. 3. solutions of strong acids and bases: • calculate the pH, pOH, [H1+], [OH1-] for each of the following solutions • 3.68x10-5 M H2SO4 • 8.19x10-3 M KOH • 0.020 M Na2O • 20.0 ml or 0.020 M NaOH mixed with 20.0 ml of 0.040 M HCl Chapter 15 Notes

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