Question

Consider the ionization constants cyanic acid (HOCN) : Ka= 3.5×10−4; ammonia (NH3): Kb= 1.8×10−5. A solution

of ammonium cyanate (NH4OCN) is 1. acidic, because the cation and the anion hydrolyze to the same extent.
2. acidic, because the anion hydrolyzes to a greater extent than the cation.
3. basic, because the cation hydrolyzes to a greater extent than the anion.
4. basic, because the anion hydrolyzes to a greater extent than the cation.
5. neutral, because the cation hydrolyzes to a greater extent than the anion.
6. neutral, because the anion hydrolyzes to a greater extent than the cation.
7. neutral, because NH4OCN is a weak base/weak acid salt. 8. basic, because the cation and the anion hydrolyze to the same extent.
9. acidic, because the cation hydrolyzes to a greater extent than the anion.
10. neutral, because the cation and the anion hydrolyze to the same extent.

Answer 1

Answer: acidic, because the cation hydrolyzes to a

greater extent than the anion.

Answer 2

The correct answer for this question is this one:

2. acidic, because the anion hydrolyzes to a greater extent than the cation.
3. basic, because the cation hydrolyzes to a greater extent than the anion.
5. neutral, because the cation hydrolyzes to a greater extent than the anion.
7. neutral, because NH4OCN is a weak base/weak acid salt. 8. basic, because the cation and the anion hydrolyze to the same extent.
10. neutral, because the cation and the anion hydrolyze to the same extent.
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