#22 - Chapter 15: Acids and Bases Acid/bases Strength, Weak...

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Chapter 15: Acids and Bases Acid/bases Strength, Weak Acids, Acid Ionization Constant (Sec. 15.4 – 15.5)
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C. The pH (and pOH) Scale – A Measures of Acidity (Sec. 15.3) pH = -log [H + ] pH = -log [H 3 O + ] or The pH scale: The pOH scale: pOH = -log [OH - ] At 25 0 C: pH + pOH = pK w =14.00 The connection between the pH and pOH scales: [H + ] = [OH - ] [H + ] > [OH - ] [H + ] < [OH - ] neutral acidic basic [H + ] = 1 x 10 -7 [H + ] > 1 x 10 -7 [H + ] < 1 x 10 -7 pH = 7 pH < 7 pH > 7 pH [H + ] At 25 0 C the solution is: Review from the last lecture:
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D. Strength of Acids and Bases (Sec. 15.4) Recommended problems: 15.31-15.36, 15.43-15.45, 15.47(a),15.48(a),15.49 Strong Acid Weak Acid
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D. Strength of Acids and Bases (Sec. 15.4) What is the pH of a 2 x 10 -3 M HNO 3 solution? HNO 3 is a strong acid – 100% dissociation. HNO 3 ( aq ) + H 2 O ( l ) H 3 O + ( aq ) + NO 3 - ( aq ) Start End 0.002 M 0.0 M 0.0 M 0.0 M 0.002 M 0.002 M pH = -log [H + ] = -log [H 3 O + ] = -log(0.002) = 2.7 Monoprotic/polyprotic acid
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D. Strength of Acids and Bases
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#22 - Chapter 15: Acids and Bases Acid/bases Strength, Weak...

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