Consider a Solution of 2

question 18

Multiple Choice

Consider a solution of 2.0 M HCN and 1.0 M NaCN (K_a for HCN = 6.2  10^-10) . Which of the following statements is true?

• A) The solution is not a buffer because [HCN] is not equal to [CN^-].
• B) [OH^-] > [H⁺]
• C) The pH will be below 7.00 because the concentration of the acid is greater than that of the base.
• D) The buffer will be more resistant to pH changes from addition of strong acid than to pH changes from addition of strong base.
• E) All of these statements are false.

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