Practice Exam II

A buffer is to be prepared by adding solid sodium

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9. A buffer is to be prepared by adding solid sodium acetate to 0.10 M CH 3 COOH. Which of the following concentrations of sodium acetate will produce the most effective buffer? A) 3.0 M CH 3 COONa D) 1.5 M CH 3 COONa B) 2.5 M CH 3 COONa E) 0.30 M CH 3 COONa C) 2.0 M CH 3 COONa 10. A buffer is prepared by adding 1.00 L of 1.0 M HCl to 750 mL of 1.5 M NaHCOO. What is the pH of this buffer? K a = 1.7 × 10 –4 Questions 11-13: Titrate 20.0 mL of 0.200 M HOBr with 0.100 M NaOH. ( K a HOBr = 2.5 x 10 -9 ) 11.What is the pH after 20.0 mL of the NaOH solution is added? 12. What is the volume of base, in mL, needed to reach the equivalence point? 13. What is the pH at the equivalence point? A) 7.00 B) 3.29 C) 10.71 D) 4.40
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CH 223: 11:00 AM Spring 2012 5 of 7 KBrO 3 (s) S o = 149 J/K KBr(s) S o = 96 J/K O 2 (g) S o = 205 J/K 14. Given: H 2 O( aq ) + H 2 O( l ) H 3 O + ( aq ) + OH - ( aq ) Δ H ° rxn > 0 When the temperature of a sample of pure water is raised above 25 °C,
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  • Spring '13
  • KorakodChimploy
  • Chemistry, pH, Trigraph, Hydronium, hydroxide ion concentration, Hydronium ion concentration, ion concentration

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