chapter 4 - apchem

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4 Terms

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  • serial dilution

  • beers law…meanings

2
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beer lambert law

A=Ebc

y=mx+b

  • E = molar absorptivity (m-1 cm-1)

  • b/l = path length or cell width (cm)

  • c = solution concentration (M)

  • ~~~~~~~

  • y = A

  • m = Eb

  • x = c

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absorbance vs. transmittance

  • A = -logT

  • T = 10^-A

  • T = (intensity after/intensity before)

  • %T = (intensity after/intensity before)100

  • %T = 100T

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formulas

  • Molarity = mol/L

  • dilution of stock solutions: M1V1 = M2V2

  • pH = -log [H3O+]

  • [H3O+] = 10^-pH

  • pOH = -log [OH-]

  • [OH-] = 10^-pOH

  • pH + pOH = 14

  • acid-base titration (used to find concentration):

  • #H particles * MaVa = MbVb * #OH particles

  • (NOT COEFFICIENTS!!!!!!!)

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