What is the ph of a solution in which the

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What is the pH of a solution in which the concentration of hypochlorous acid is 0.50 M and the concentration of sodium hypochlorite is 1.0 M? ( K a for HOCl = 3 . 2 × 10 - 8 .) 1. 7.49 2. 8.10 3. 6.89 4. 8.31 5. 7.80 6. 7.19 7. 5.44 011 10.0 points A buffer (pH 3.70) was prepared by mixing 1.00 mole of formic acid and 1.00 mole of sodium formate to form an aqueous solution with a total volume of 1.00 L. To 400 mL of this solution was added 50.0 mL of 1.00 M NaOH. What is the pH of this solution? 1. 4.25 2. 4.39 3. 3.81 4. 3.63 5. 4.52
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estrada (gse77) – Homework 8 – Sutcliffe – (52410) 3 012 10.0 points Calculate the ratio [CH 3 COOH] [NaCH 3 COO] that gives a solution with pH = 5.00. 1. 0.36 2. 0.28 3. 0.56 4. 0.44 5. 0.63 013 10.0 points Suppose you add 0 . 001 moles of NaOH and 0 . 002 moles of HA, a weak acid, to enough water to make one liter of solution. If K a = 1 × 10 - 8 and if NaA is a strong elec- trolyte, what will be the pH of the solution at equilibrium? 1. 9 2. 7 3. 8 4. 5 5. 6 014 10.0 points Which of the following solutions would have a pH of 5.7? NOTE: (HA, HB, HC, HD, and HE are HYPOTHETICAL WEAK ACIDS) 1. Buffer solution with K a = 1 . 8 × 10 - 5 and [HD] = 1 . 07 M and [D - ] = 0 . 5 M 2. Buffer solution with K a = 2 × 10 - 6 and [HB] = 0 . 8 M and [B - ] = 0 . 8 M 3. Buffer solution with K a = 4 × 10 - 8 and [HC] = 0 . 5 M and [C - ] = 0 . 5 M 4. Buffer solution with K a = 2 . 5 × 10 - 5 and [HA] = 0 . 5 M and [A - ] = 0 . 5 M 5. Buffer solution with K a = 0 . 0005 and [HE] = 0 . 017 M and [E - ] = 0 . 17 M 015 10.0 points How many moles of solid NaF would have to be added to 1.0 L of 1.90 M HF solution to
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  • Fall '07
  • Holcombe
  • pH, Acids, Carboxylic acid

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