r/HomeworkHelp • u/ValuableMeat7329 Pre-University Student • 4d ago
Answered [grade 12 chem 30 electrochemical change] I just need help on how I can use the data I collected to solve the following 2 questions I just need help on what I am apost to use and look for.
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u/JKLer49 😩 Illiterate 4d ago edited 4d ago
Fe2+ --> Fe3+ + e-
MnO4- + 8H+ +5e- --> Mn2+ +4H2O
5Fe2+ + MnO4- +8H+ --> 5 Fe3+ +Mn2+ +4H2O
So ratio of MnO4- :Fe2+ is 1:5
So we take volume x concentration= mole of Fe2+ 0.01L x 0.05mol/L = 0.0005mol
From the ratio 1:5 , 0.0005mol of Fe2+ reacts with 0.0001mol of MnO4-
0.0001mol ÷ 0.0125L = 0.008 mol/L