1. All of the following will result in a buffer with pH = 9.5 EXCEPT:

    1. Mixing 1.8 equivalents NH3 with 1.0 equivalents NH4+.
    2. Mixing 1.6 equivalents NaCN with 1.0 equivalents HCN.
    3. Adding 0.7 equivalents HCl to 1.0 equivalents NH3.
    4. Adding 0.65 equivalents NaOH to 1.0 equivalents HCN.




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