What is the ph of 200 ml of a solution that contains

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What is the pH of 200 mL of a solution that contains 0.171 g of Ba(OH) 2 ? 1. 2.30 2. 2.00 3. 11.70 4. 12.00 correct 5. 11.00 Explanation: 007 10.0 points Which of the following produces the STRONGEST conjugate base? 1. HIO (p K a = 10 . 64) correct 2. CH 3 COOH (p K a = 4 . 75) 3. HCOOH (p K a = 3 . 75) 4. HF (p K a = 3 . 45) 5. HClO (p K a = 7 . 53) Explanation: 008 10.0 points Which substance is NOT a soluble, strong base? 1. LiOH 2. Ba(OH) 2 3. KOH 4. Zn(OH) 2 correct 5. NaOH Explanation: All are stong bases except for Zn(OH) 2 . 009 10.0 points The pH of 0 . 1 M (C 3 H 7 NH 2 ) propylamine aqueous solution was measured to be 11 . 86. What is the value of p K b of propylamine? 1. 0.11 2. 3.25 correct 3. 2.14 4. 3.35 5. 0.96 6. 11.86 Explanation: M = 0 . 1 M pH = 11 . 86
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estrada (gse77) – Homework 7 – Sutcliffe – (52410) 3 Analyzing the reaction with molarities, C 3 H 7 NH 2 + H 2 O C 3 H 7 NH + 3 + OH - 0 . 1 - 0 0 - x - x x 0 . 1 - x - x x pOH = 14 - 11 . 86 = 2 . 14 . [C 3 H 7 NH + 3 ] = [OH - ] = 10 - pOH = 10 - 2 . 14 = 0 . 00724436 mol / L The K b is K b = [C 3 H 7 NH + 3 ][OH - ] [C 3 H 7 NH 2 ] = (0 . 00724436) 2 0 . 1 - 0 . 00724436 = 0 . 000565796 . and the p K b is p K b = - log(0 . 000565796) = 3 . 24734 . 010 10.0 points What is the H + ion concentration in a 0.50 mol/L solution of a weak base that has an ionization constant ( K b ) of 2.0 × 10 - 8 ? 1. 1 . 0 × 10 - 8 mol/L 2. 1 . 0 × 10 - 4 mol/L 3. 1 . 0 × 10 - 10 mol/L correct 4. 8 . 0 × 10 - 16 mol/L 5. 2 . 0 × 10 - 10 mol/L Explanation: 011 10.0 points Consider a solution that is 0.10 M in a weak triprotic acid which is represented by the gen- eral formula H 3 A with the following ionization constants: K 1 = 1 . 0 × 10 - 3 , K 2 = 1 . 0 × 10 - 8 , K 3 = 1 . 0 × 10 - 12 . Which species is present in the lowest concentration in 0.10 M H 3 A solution? 1. OH - 2. HA 2 - 3. H 3 A 4. H 3 O + 5. A 3 - correct Explanation: 012 10.0 points A diprotic acid H 2 A has values of K a1 = 1 . 0 × 10 - 6 and K a2 = 1 . 0 × 10 - 10 . What is the [A 2 - ] in a 0.10 M solution of H 2 A? 1. 3 . 2 × 10 - 4 M 2. 0.10 M 3. 1 . 0 × 10 - 10 M correct 4. 0.20 M 5. 3 . 2 × 10 - 6 M Explanation: 013 10.0 points What is the pH of a 0.020 M solution of hydrosulfuric acid, a diprotic acid?
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  • Fall '07
  • Holcombe
  • pH, Acids, ESTRADA

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