Acidified potassium permanganate

[lizzieb]

Can someone give me a recipe for 0.1M acidified potassium permanganate please?

The one in my handwritten recipe book is impossible to decipher, and I can't find it in the 'bible' (The Laboratory)!

Many thanks,

[lada]

I have not used it by my recipe recommends o.1M permanganate in 4M sulfuric acid.
4g KMnO4 in 250mL of 4M H2SO4. This seems very strong.
Lada

[lizzieb]

Thanks, Lada

Mine mentions the 250mL of 4M H₂SO₄, and what looks like .74g of Pot Perm, but this figure has been written over, so I can't be sure.

Grateful for verification!

[fibreweb]

I used 200 ml 0f 0.02 M Potassium Permanganate acidified with 3ml of Sulfuric acid. That was astisfactory for Ashley so it should be right for just about anyone! (year 12 chem?)

Wendy

[Robb]

Hi All,

Any Concentration will do but I would not use anything higher than 4M.

For the ease of prep and also the most common solution I would use is 2M. This way you can be adiment that at this concentration there won't be any over flux of H₂SO₄ from a higher Concentration.

Cheers,

Robb.....

[lizzieb]

Thanks Lada, Wendy & Robb, for your input,

but I'm still a little confused

Would you please confirm the amounts for me?

[Robb]

Hi Lizzieb

It comes down to how the solution is to be used and Also what strength is really required.

A good place to start is by using 2M H₂SO₄ and adding 200mL to 1000mL (1L). This can be added to a 0.5M to 1M solution of KMnO₄. without fuss.

If you need more or less work on the above Volume and Concenration and work a ratio from that.

(Keep in mind though that this is a universal solution of Acidified Potassium Permanganate Solution, which contains a good mixture of both Acid and the Permanganate Radical).

Cheers,

Robb.....

[lada]

Hi, for 0.1M you will need 15.8g of permanganate in 1L of solution, or 4g in 250mL of solution. Is this what you need???
Lada

[lizzieb]

Morning, Robb,

Many thanks for clarifying that,

[ellice]

I tend to make it up as it's needed, as it needs to be fresh. So I have 0.3g KMnO4 in a 200mL beaker, and fill to 200mL mark with 1M H2SO4 (or 1.6g to 1L). This gives about 8 dropper bottles.
Regards, Ellice.

[lizzieb]

Thanks to everyone who helped me with this.

I added 4g of KMnO₄ to 250mL of 2M H₂SO₄, which gave me 10 dropper bottles.

Great result, all good.

Wrote it in the Laboratory for future reference, and put a typed copy into the recipe book!!

Happy Tuesday!

[Mother]

Hi all
We just did a prac. which required acidified potassium permanganate. I made up .01M of KMnO₄ and just added a couple of drops of conc. sulfuric acid.Teacher was happy with the result.So there you go!! Would you call it bucket science? If so, it worked a treat!!!
Cheers
Mother