BUFFER QUESTION KEY

BUFFER QUESTION KEY - biochemical studies. Its buffering...

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BUFFER QUESTION KEY 24. Calculate the pH of each of the following solutions at 25 o C. a. 0.100 M HONH 2 (K b = 1.1 x 10 -8 ) 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
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38. A buffered solution is made by adding 50.0 g NH 4 Cl to 1.00 L of a 0.75 M solution of NH 3 . Calculate the pH of the final solution. (Assume no volume change.) 48. Which of the following mixtures would result in a buffered solution when 1.0 L of each of the solutions are mixed? a. 0.20 M HNO 3 and 0.40 M NaNO 3 b. 0.20 M HNO 3 and 0.40 M HF c. 0.20 M HNO 3 and 0.40 M NaF d. 0.20 M HNO 3 and 0.40 M NaOH
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122. Tris(hydroxymethyl)aminomethane, commonly called TRIS or Trizma, is often used as a buffer in
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Unformatted text preview: biochemical studies. Its buffering range is pH 7 to 9, and K b is 1.19 x 10-6 for the aqueous reaction shown in the problem in the textbook. a. What is the optimal pH for TRIS buffers? b. Calculate the ratio of [TRIS]/[TRISH + ] at pH = 7.00 and at pH = 9.00. c. A buffer is prepared by diluting 50.0 g TRIS base and 65.0 g TRIS hydrochloride (written as TRISHCl) to a total volume of 2.0 L. What is the pH of this buffer? What is the pH after 0.50 mL of 12 M HCl is added to a 200.0 mL portion of the buffer?...
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This note was uploaded on 07/22/2008 for the course CHEM 105A taught by Professor Bau during the Summer '04 term at USC.

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BUFFER QUESTION KEY - biochemical studies. Its buffering...

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