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Day 3 Acid-Base
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Other methods of determining pH
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If molarity is not known, pH can be determined by…
Acid-Base Indicators pH meter Titration
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Indicator Solutions Change color depending on pH of test solution
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Indicators
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Indicators
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Indicators
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Problems with indicator solutions:
If you have a colored solution Approx pH value not exact Temperature affects color
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pH meter
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pH meter consists of a measuring probe
electronic meter: measures & displays the pH reading have to calibrate probe
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Titration Use Buret, Erlenmeyer flask, & indicator
Use M1V1 = M2V2 to determine molarity of unknown
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Titration
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Titration
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Answer the following questions while watching the video clips:
Where do you read/How do you read a burette? What hand do you use to swirl the Erlenmeyer flask? What hand do use to adjust the burette? When do you know you are getting close to the endpoint? How is the standard solution added as you get close to the endpoint? When do you know you have achieved the endpoint?
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Titration Video Clip #1 (3:15) Titration Video Clip # 2 ( 6:07)
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Now, do the titration pre-lab
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Tonight’s Homework
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