0 Lewis Dot Structures, Hybridization, and 132 Tu^ ;ndividual Lewis structures a
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0 Lewis Dot Structures, Hybridization, and 132 Tu^ ;ndividual Lewis structures are lumped together under a common lh arises at this point is " ANAL 367: The Chemistry and Qualitative Analysis of Post-Laboratory (Use the spaces provided for the answers a 1. Suppose that a solution is tested for NO2 ion by 4 adding 3M H2S04 and heating, repeating this process until no further reaction occurs. This solution is then analyzed for NO3 ion by adding FeSO4 solu- tion and more H2SO4, heating the test tube and its contents. The NO3 ion reaction is positive. In this case, is it accurate to state that NO3 ion was present in the original solution? Briefly explain. Write appro- priate equations to support your answer. 2. A solution contains a mixture of Cl and Br ions.Explanation / Answer
Adding 3M H2SO4 and heating, repeating the process this until no further reaction occurs means nitrite (NO2-) is present.
NO2- + H2SO4 --> HSO4- + HNO2
3HNO2 --> HNO3 + H2O + 2NO
2NO + O2--> 2NO2
In presence of nitrite, nitrate cannot be detected because nitrous acid (HNO2) set free from nitrite by sulfuric acid is partially oxidized to nitric acid which is detected even if no nitrate was originally present.
FeSO4 + NO --> [FeSO4.NO] black ppt
The overall reaction is the reduction of the nitrate ion by iron(II) which is oxidised to iron(III) and formation of a nitrosonium complex where nitric oxide is reduced to NO-.
2HNO3 + 3H2SO4 + 6FeSO4 --->> 3Fe2(SO4)3 + 2NO + 4H2O
[Fe(H2O)6]SO4 + NO --> [Fe(H2O)5(NO)]SO4 + H2O
[Fe(H2O)5(NO)]SO4 is the brown ring complex.
No it is inaccurate to state that NO3- ion was present in the original solution as we have completely converted NO2- ion to NO3- by 3HNO2 --> HNO3 + H2O + 2NO.
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