Exam #4 Review Clicker Questions

Exam #4 Review Clicker Questions - Chapter 15: Acids and...

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Unformatted text preview: Chapter 15: Acids and Bases Acid/bases definitions, the ion product of water, the pH scale (Sec. 15.1 15.3) B. Brnsted Acids and Bases (Sec. 15.1) acid base base acid Brnsted acid is a substance that donates protons (the molecule must have a removable proton) Brnsted base is a substance that accepts protons (the molecule must have a pair of non-bonding electrons) Clicker Questions Join Channel 43 Step- 1: Press Go Step- 2: Press 43 Step- 3: Press Go Which of one the following statements is TRUE ? A r r h e n i u s a c i d i s a p r o t . . A r r h e n i u s b a s e i s a p r o t . . B r n s t e d a c i d i s a p r o t . . B r n s t e d b a s e i s a p r o t . . 0% 0% 0% 0% 1. Arrhenius acid is a proton (H+) acceptor. 2. Arrhenius base is a proton (H+) acceptor. 3. Brnsted acid is a proton (H+) donor. 4. Brnsted base is a proton (H+) donor. Which of the following is the hydroxide ion? 0% 0% 0% 0% 0% 1. H 3 O + 2. OH- 3. H 2 O 4. H 3 O- 5. H 2 O + B. Brnsted Acids and Bases (Sec. 15.1) acid 1 base 2 base 1 acid 2 Conjugate acid-base pairs: Conjugate acid-base pairs: acid 1 base 1 acid 2 base 2 H 2 O is amphiprotic , i.e. could be either an acid or a base (other examples: HCO 3- , HSO 4- ) The conjugate acid of HSO 4- is __________. 0% 0% 0% 0% 0% 1. SO 4 2- 2. H 2 SO 4 3. HSO 4 + 4. H + 5. HSO 3 + The conjugate base of HSO 4- is __________. 0% 0% 0% 0% 0% 1. SO 4 2- 2. H 2 SO 4 3. HSO 4 + 4. H + 5. HSO 3 + B. Acid-Base Properties of Water (Sec. 15.2) Autoionization of water: O H H + O H H O H H H O H- + [ ] + acid 1 base 1 base 2 acid 2 At 25 C: K w (= K' c [H 2 O]) =[H 3 O + ][OH- ] = [H + ][OH- ] = 1.0 x 10-14 Note: the reaction constant K w has a subscript w for water and is called the ion-product constant K' c = [H 3 O + ][OH- ] / [H 2 O] = [H + ][OH- ] / [H 2 O] [H 2 O] =const 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 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 C the solution is: What is the concentration of [H 3 O + ] in a solution at 25.0 C with pH = 6.31?...
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This note was uploaded on 10/21/2010 for the course CHEM 155 taught by Professor Burnett,joe during the Fall '08 term at Iowa State.

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Exam #4 Review Clicker Questions - Chapter 15: Acids and...

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