1)Suppose that you have 0.500 L of each of the following solutions, and an unlim

Question

1)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.)

Explanation / Answer

If [H3O+ ] is 1 x 10-4 moles per liter, the pH of the solution is, by the equation, 4. ... so, by Equation 2, [H3O+ ] must be 1 x 10-7 M. Therefore, the pH of distilled ... one can determine the pH of the unknown to within about 0.3 pH units. .... Then the pH would be 6, and the buffer would have very little capacity for added NaOH

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