I am supose to write seperate oxidation and reduction half-reactions for this equation, 3 NO3- + 8 Al + 5 OH- + 18 H2O -gt; 3 NH3 + 8 Al(OH)4-What are the half reactions?Also there is a question on my lab that asks quot;In the nitrate test, why must care be taken to keep the moist litmus paper from coming in contact with the cotton or the solution?quot;
half reactions (unbalanced): NO3- - NH3 Al - Al(OH)4- half reactions (balanced): 8e- + 6H2O + NO3- - NH3 + 9OH- 4OH- + Al - Al(OH)4- + 3e- In the nitrate test, why must care be taken to keep the moist litmus paper from coming in contact with the cotton or the solution? I'm not an expert on this test, but here is what I thinkThe solution itself, before heating, is basicThat means, if you touch the solution with the litmus paper, it will turn blueWhat if there is no nitrate in the solution? However, to carry out the test, the solution MUST be basic to startSo, the cotton wad is to protect the litmus paper from being splashed by the solution during the heating and getting solution on the paperThat would turn the paper blue and, if there was no nitrate in the solution, give a false positive for the testI hope that was clear.
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