I'm looking into purchasing Potassium Permanganate, KMnO4, and after reading the msds sheet for the chemical have a few questions that were left unanswered. Normally I would just go to google for this however I was unable to find answers to either, so I turn to this forum.
Firstly, is there a shelf life for Potassium Permanganate?, as I don't want to purchase it, use it for a few reactions, let it sit for a few months and find out later that it's all decomposed.
Secondly, after reading the msds for the commercial KMnO4 referred to as "pot perm" I discovered that the purity can be from 60-100%. However the commercial brand is cheaper than lab grade, which is doubtless of a much higher and smaller purity range. So is there a significant enough difference in the purities to where the use of the commercial brand would effect the outcome of my experiments?