Spectrophotometry Chpt 18

Spectrophotometry Chpt 18 - Absorption of Yellow and Green...

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1 Quantitative Chemical Analysis Seventh Edition Quantitative Chemical Analysis Seventh Edition Chapter 18 Fundamentals of Spectrophotometry Copyright © 2007 by W. H. Freeman and Company Daniel C. Harris Daniel C. Harris Light has: • Intensity • Color (wavelength) • Polarization • Intensity Transmittance Absorbance
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2 Transmittance Absorbance Beer’s Law ε = 313 M -1 cm -1 b = 2 cm T = 3.16% = 0.0316 A = -logT = 1.50 c = 1.5/(313 M -1 ) (2 cm -1 ) = 0.0024 M dP( x )/dx = - κ P( x ) Æ P( x ) = exp(- κ x )
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5 (wavelength) x (frequency) = speed [m/s] λν = c [10 8 m/s]
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6 436 nm Æ what frequency?
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7 Visible spectrum Your Eyes See the Color that is NOT Absobed Hexaquotitanium (III) Solutions Appear Violet Due to
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Unformatted text preview: Absorption of Yellow and Green Light Subtraction of Light by Absorption Leads to Color you See 8 What makes a molecule absorb light? What makes a molecule absorb light? What makes a molecule absorb light? Electron motion ~ 500 nm UV-VIS What makes a molecule absorb light? Nuclear motion ~ 5000 nm infrared 9 What makes a molecule absorb light? Nuclear motion ~ 500,000 nm microwave What makes a molecule absorb light? What makes a molecule absorb light? What makes a molecule absorb light? 10 What makes a molecule absorb light? What makes a molecule absorb light? E = h E = h 11 E = h E = h...
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Spectrophotometry Chpt 18 - Absorption of Yellow and Green...

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