In a previous video by NurdRage, he showed you how to make manganese sulfate ("How to make MnSO4 from MNO2 (two separate ways)"), but there can be situations where the iron in the precursor would carry over and contaminate the product. Recrystallization doesn't work for this high level of contamination, so a different approach is needed.
Watch this science video tutorial from Nurd Rage on how to purify manganese sulfate contaminated by iron sulfate with Dr. Lithium.
The process is called selective precipitation. By carefully controlling the amount of hydroxides in solution, we can precipitate out the iron hydroxides but leave manganese sulfate in the solution.
Brought to you by one of WonderHowTo's favorite scientists, NurdRage.