Chemistry -- to Dr.Bob
posted by James .
i put 1 for the spaces before both of the Fes and got them both wrong but i got the others right. thank you
Balance the equation:
Note: If a chemical species coefficient is "1" then "1" needs to be entered in the field before that species.
1 MnO4– + 8H+ +__ Fe2+ -->1Mn2+ + 4H2O + __Fe3+
put 6 before Fe2+ and Fe3+
wait why is it 6?
because its a redox reaction. the number of electrons in the Fe2+ to Fe3+ half-equation must equal the number of electrons in the MnO4 to Mn2+ half-equation, which is 6. Thus you need to have 6 Fe2+ and 6 Fe3+ also.
Balance each half-equation first, and then combine the 2. :)
Mn changes from +7 on the left to +2 on the right.
Fe changes from +2 on the left to +3 on the right.
Therefore, place a 5 for both Fe on the left and right. The others are ok.
don't put 6. it's wrong in webwork
Put 5 before Fe2+ and before Fe3+