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April 16, 2014

Homework Help: chem

Posted by sabrina: This is how the question is written. on Wednesday, November 28, 2012 at 12:34am.

Suppose that you have 0.500 L of each of the following solutions, and an unlimited supply of water. (Note: C9H7NHBr is a salt containing the ions C9H7NH+ and Br− and C9H7N is quinoline, an organic base with pKb = 6.24 at 298 K. If you like, you may represent C9H7NH+ as HB+ and C9H7N as B.)
0.113 mol L−1 C9H7NHBr (aq) 0.104 mol L−1 HBr(aq) 0.122 mol L−1 NaOH(aq)
(a)Provide simple instructions for preparing 1.00 L of a solution having pH = 7.00 at 298 K. Your instructions should include the volumes of the solutions required.
(b) What is the buffer capacity of the resulting solution? (The buffer capacity is the number of moles of NaOH that must be added to 1.0 L of solution to raise the pH by one unit.)

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