# Problem: Which reaction below corresponds to the K f for Co(NH3)42+:             A.  Co2+(aq) + 4 NH3(aq) → Co(NH3)42+(aq)             B.  Co(s) + 4 NH3+(aq) → Co(NH3)42+(aq)             C.  Co(NH3)42+(aq) → Co2+(aq) + 4 NH3(aq)             D. Co(NH3)42+(aq) → Co(s) + 4 NH3+(aq)             E. Co(NH3)42+(aq) + 4 H2O(l) → Co(NH4)42+(aq) + 4 OH−(aq)

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###### Problem Details

Which reaction below corresponds to the K f for Co(NH3)42+:

A.  Co2+(aq) + 4 NH3(aq) → Co(NH3)42+(aq)

B.  Co(s) + 4 NH3+(aq) → Co(NH3)42+(aq)

C.  Co(NH3)42+(aq) → Co2+(aq) + 4 NH3(aq)

D. Co(NH3)42+(aq) → Co(s) + 4 NH3+(aq)

E. Co(NH3)42+(aq) + 4 H2O(l) → Co(NH4)42+(aq) + 4 OH(aq)

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Formation Constant concept. If you need more Formation Constant practice, you can also practice Formation Constant practice problems.

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Based on our data, we think this problem is relevant for Professor Paxton's class at BYU.