Chemistry 2e

# Key Equations

Chemistry 2eKey Equations
• Kw = [H3O+][OH] = 1.0 $××$ 10−14 (at 25 °C)
• $pH=−log[H3O+]pH=−log[H3O+]$
• pOH = −log[OH]
• [H3O+] = 10−pH
• [OH] = 10−pOH
• pH + pOH = pKw = 14.00 at 25 °C
• $Ka=[H3O+][A−][HA]Ka=[H3O+][A−][HA]$
• $Kb=[HB+][OH−][B]Kb=[HB+][OH−][B]$
• Ka $××$ Kb = 1.0 $××$ 10−14 = Kw
• $Percent ionization=[H3O+]eq[HA]0×100Percent ionization=[H3O+]eq[HA]0×100$
• pKa = −log Ka
• pKb = −log Kb
• $pH=pKa+log[A−][HA]pH=pKa+log[A−][HA]$

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