Question

- 1 hour 8/20 Content attribution Balance the following redox reaction in an acidic solution. How many water molecules are in the balanced reaction? Ga + NO3 → Ga3+ + NO Select the correct answer below: 0 0 0 0 FEEDBACK Content attribution Which pair of aqueous solutions, when mixed, will form a precipitate

Answer 1

Ga + NO₃^- ---> Ga³⁺ + NO

O.S. 0 +5           +3       +2

Oxidation half reaction :

Ga ---> Ga³⁺

Balance charge : Ga ---> Ga³⁺+3e^-                    -------------------------(1)

Reduction half reaction :

NO₃^- ---> NO

Balance O atoms : NO₃^- ---> NO + 2H₂O

Balance H atoms : NO₃^- + 4H⁺ ---> NO + 2H₂O

Balance charge : NO₃^- + 4H⁺ +3e^- ---> NO + 2H₂O                 ----------------------------(2)

(1) + (2) gives the overall reaction :

Ga + NO₃^- + 4H⁺ ---> Ga³⁺ + NO + 2H₂O

So, the number of water molecules are 2.