Tip:
Highlight text to annotate it
X
Greetings! Today we 're gonna make a solution of sodium permanganate, a substitute for the
potassium salt.
In general, to make a permanganate salt all you need is a source of manganese (in our
case manganese dioxide), a metal hydroxide that corresponds to the cation of the salt
we want to make, so we are using sodium hydroxide for sodium permanganate,
and an oxidizer, that will oxidize manganese to its +6 oxidation state.
So let's get started. Place 2,6 grams of manganese dioxide in a test tube. This has to be as
pure as it is possible; in case you use battery-grade manganese dioxide you should
not be expecting a high-quality yield, since it is highly contaminated
with other metal salts.
Now place 1,2 grams of crushed sodium hydroxide pellets and 1
gram of sodium chlorate the one that was made in a previous video,
in the same test tube. All reactants must be finely powdered, to increase the reaction
rate.
Give the test tube a good shake to mix the reactants very well.
Now carefully heat up the test tube to force the contents into reaction. You will notice
water vapor coming off as a side-product. Stop heating when you hear
no sound from the evaporating water. Remember to heat
all sides.
This is the reaction that takes place in the test tube while heating. Sodium chlorate oxidizes
manganese (IV) oxide to manganate anions.
After the reaction has stopped, you 'll see a green solid on the glass. This is sodium
manganate. We need to extract this but it's a bit hard
to dissolve it in the tube. A hammer will do the job.
Break the test tube and try to collect most of the green chunks of sodium manganate.
Once you seperate the larger pieces, place them in a beaker and dissolve using 50 mL of water.
It seems there are suspended particles of unreacted
manganese dioxide in my solution; nothing goes wrong, I 'll just let it
settle down for an hour or so.
For some technical reason, I had to break the whole video in two parts. So stay tuned!
Thank you for watching my video. Please subscribe, like, and leave a comment.