Filtration of Potassium Nitrosodisulfonate / Fremy's Salt

Note: the "poor explanation" of my video is strictly due to the fact that this experiment corresponds to a university class. I can't just give out reactions and answers. The video can be used to analyse the reaction. Were there bubbles (i.e., evolution of a gas)? If so, what gas is it? Does the permanganate solution simply dilute in colour, or is there a colour change? This would clearly indicate a reaction. Is there precipitate formation? Again, very indicative of a reaction, if there is. Think about what you observe to help answer questions on the experiment, such as chemical equations. In the case of this video, it just shows the final step for isolation of the salt, so one can see how on-track one is with the experiment (i.e., to see if the synthesis was successful).

In my "Chemistry of the Main Group Elements" lab at the University of Manitoba in Winnipeg, we synthesised the paramagnetic compound "Fremy's salt". Fremy's sale actually can refer to two compounds, but in our case, it's the potassium compound, not the disodium acid. This video shows the near-final steps, where we isolate Fremy's salt from the solution in the beaker in which it was prepared.

In this preparation, we used water and crushed ice, sodium nitrite, sodium bisulfite, acetic acid, ammonia, potassium permanganate, Celite, manganese dioxide, potassium chloride, potassium hydroxide, and ethanol.

Sorry about being sounding so spaced out in this video; it's been a long week.

Category:

Science & Technology

Tags:

• Potassium
• Nitrosodisulfonate
• Fremy
• salt
• filtration
• Preparation
• Büchner
• K2ON(SO3)2
• University
• Manitoba
• Winnipeg
• Chemistry

[djtrix003]

Ah.  i love chemistry. :)

[ummacles]

Yeah, me too. I mean, I guess I do, now. It was such a chore when actually taking the courses, but now that it's winter break, I've been having dreams entirely about chemistry EVERY SINGLE NIGHT.

[balee85]

i did it 3 times yesterday and i got a clear solution. do u know why? is it because it need to be cold or what?

[antiswattt]

wow.. what a waste of chemicals.. potassium permanganate.. :[

[66amantedelamusica99]

Hey! I think I took that course at the UofM at the same time as you :D. I loved this experiment. Something really funny happened to my group's Fremy's salt. For some reason we left the Buchner apparatus while it was filtering and when we came back a couple minutes later we found that the Fremy's salt had combusted!!! I was ecstatic! All that was left was a white plasticy solid.

[rosaquimica09]

I am trying to produce the salt but I am not getting success, please send me your procedure

[TotallyKaraLynn]

Oooo Purply :)

[slaintedan]

For purely aesthetic reasons, some clients like the look of oxidized wood. I've been researching some OTC products available through woodworking suppliers so we'll see if I find something that works well.

[silendshade]

nitric acid would oxidize it, since it generally oxidizes everything non-metal except halogens, alto that would be way to expensive (and its not an OTC chemical), why would you want to oxidize hardwood?

(is that hardwood a piece of wood or a whole tree or is it a powder?)

[slaintedan]

Great video! I'm a woodworker and I'm trying to find a way to oxidize hardwoods, in particular Maple and Walnut. Do you have any ideas as to how I can accomplish this? Thanks!

[djtrix003]

Yeah, its mostly a love/hate relationship. :D