Chapter_15_Homework_Key

Chapter_15_Homework_Key - Chapter 15 Homework Solutions 21...

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Chapter 15 Homework Solutions 21. A certain buffer is made by dissolving NaHCO 3 and Na 2 CO 3 in some water. Write equations to show how this buffer neutralizes H + and OH - . 24. Calculate the pH of each of the following solutions. a. 0.100 M HONH 2 (K b = 1.1 x 10 -8 )

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b. 0.100 M HONH 3 Cl c. pure H 2 O d. a mixture containing 0.100 M HONH 2 and 0.100 M HONH 3 Cl
26. Compare the percent ionization of the base in Exercise 24a with the percent ionization of the base in Exercise 24d. Explain any differences. 37. Calculate the pH of a buffer solution prepared by dissolving 21.46 g of benzoic acid (HC 7 H 5 O 2 ) and 37.68 g of sodium benzoate in 200.0 mL of solution.

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41. Calculate the mass of sodium acetate that must be added to 500.0 mL of 0.200 M acetic acid to form a pH = 5.00 buffer solution.
47. Which of the following mixtures would result in buffered solutions when 1.0 L of each of the two solutions are mixed? a. 0.1 M KOH and 0.1 M CH 3 NH 3 Cl b. 0.1 M KOH and 0.2 M CH 3 NH 2 c. 0.2 M KOH and 0.1 M CH 3 NH 3 Cl d. 0.1 M KOH and 0.2 M CH 3 NH 3 Cl 48. Which of the following mixtures would result in buffered solutions when 1.0 L of each of the two solutions are mixed? a. 0.2 M HNO 3 and 0.4 M NaNO 3 b. 0.2 M HNO 3 and 0.4 M HF c. 0.2 M HNO 3 and 0.4 M NaF d. 0.2 M HNO 3 and 0.4 M NaOH

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49. How many moles of NaOH must be added to 1.0 L of 2.0 M HC 2 H 3 O 2 to produce a solution buffered at each pH? a. pH = pK a b. pH = 4.00 c. pH = 5.00
77. Use the following data to calculate the K sp value of each solid. a. the solubility of CaC 2 O 4 is 6.1 x 10 -3 g/L b. the solubility of BiI 3 is 1.32 x 10 -5 mol/L 80. The concentration of Ag + in a solution saturated with Ag 2 C 2 O 4 (s) is 2.2 x 10 -4 M. Calculate K sp for Ag 2 C 2 O 4 . 83. The solubility of the ionic compound M 2 X 3 , having a molar mass of 288 g/mol, is 3.60 x 10 -7 g/L. Calculate the K sp of the compound.

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Calculate the molar solubility of Co(OH) 3 , K sp = 2.5 x 10 -43 . 88. For each of the following pairs of solids, determine which solid has the smallest molar solubility. a. FeC
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Chapter_15_Homework_Key - Chapter 15 Homework Solutions 21...

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