0
The permanganate solution has to cool and stand overnight before it can be filtered to remove MnO2 (manganese dioxide)
Potassium permanganate is not a primary standard. It is difficult to obtain the substance perfectly pure and completely free from manganese dioxide. Moreover, ordinary distilled water is likely to contain reducing substances (traces of organic matter, etc.) which will react with the potassium permanganate to form manganese dioxide. The presence of the latter is very objectionable because it catalyses the auto-decomposition of the permanganate solution on standing. The decomposition:
4MnO4- + 2H2O = 4MnO2+3O2+4OH-
is catalysed by solid manganese dioxide. Permanganate is inherently unstable in the presence of manganese(II) ions:
2MnO4-+3Mn2+ +2H2O = 5MnO2 + 4H+;
this reaction is slow in acid solution, but is very rapid in neutral solution. For these reasons, potassium permanganate solution is rarely made up by dissolving weighed amounts of the highly purified (e.g., A.R.) solid in water; it is more usual to heat a freshly prepared solution to boiling and keep it on the steam bath for an hour or so, and then filter the solution through a non-reducing filtering medium, such as purified glass wool or a sintered glass filtering crucible (porosity No. 4).
Alternatively, the solution may be allowed to stand for 2-3 days at room temperature before filtration. The glass-stoppered bottle or flask should bc carefully freed from grease and prior deposits of manganese dioxide: this may be done by rinsing with dichromate-sulphuric acid cleaning mixture and then thoroughly with distilled water. Acidic and alkaline solutions are less stable than neutral ones. Solutions of permanganate should be protected from unnecessary exposure to light; a dark-coloured bottle is recommended. Diffuse daylight causes no appreciable decomposition, but bright sunlight slowly decomposes even pure solutions.
What else can I help you with?
Why pH probes always kept immersed in 3M Kcl solution?
I just got done talking with a vendor for pH probes and he explained that the KCl solution helps facilitate the measurement of the hydrogen ions with the electrode. It will actually seep out in small quantities from the tip which is a membrane.
Can glycerin and potassium permanganate be found in products easlisly perchased at a drug store or any common store if so what name and use of each product?
Glycerol is the non-chemical name for glycerine. It's an over-the-counter gooey liquid you can get at most drug stores. Potassium permanganate is a very common pool fertilizer that you can purchase at some large 'mart' stores, and can always find at any pool store, in a black roughly powdered form. Glycerine is pretty safe. In fact, there are quite a few common uses for it, including soap, lotion, and even as a laxative. Potassium permanganate is a strong oxidizer, and therefore needs to be kept away from ignition sources. (Unless, of course, you're using it for one.)
A silver spoon is kept immersed in an aqueous copper sulphate solution what changes will take place?
as silver is less reactive than copper the silver when immersed will loose its electrons and the copper will displace it. i apologize if it is the wrong answer.... this is actually a guess :P
How long was the longest thunderstorm?
The longest recorded continuous thunderstorm lasted for more than 7 days in the South of France in August 2021. This extreme weather event produced constant thunder and lightning for an unprecedented duration.
Why is sodium kept in oil?
Sodium is kept immersed in kerosene because it reacts so vigorously that they catch fire when kept in the open. Hence to protect them and to prevent accidental fires, they are kept immersed in kerosene oil.
Why are fehling solution A and B kept separately?
fehling a is copper sulphate and fehling b is alkaline solution of sodium pottasium tartarate
What happens if salt solution is kept for few days?
If a salt solution is kept for a few days, the water will slowly evaporate, increasing the concentration of salt in the solution. This may eventually lead to the formation of salt crystals as the water continues to evaporate. The solution may also become more viscous over time due to the increased concentration of salt.
Why is mitochondria kept in sucrose solution when extracted from cell?
Mitochondria are kept in sucrose solution to maintain their osmotic balance and prevent them from swelling or shrinking due to changes in their external environment. The sucrose solution helps to stabilize the mitochondria and maintain their structural integrity during the extraction process.
How many days did anna hazare kept anshan?
11 days
How long can uncooked ham be left out?
Meats are kept better in the freezer. Meats can be kept in the refrigerator for 3 to 4 days if raw and 1 to 2 days longer if cooked. Always place cooked meats in an airtight container.
Why do grapes shrink when kept in sugar solution?
osmosis takes place
What kept Order and society in the old days?
shotguns
What will happen if dried apricots are kept in sugar solution?
If dried apricots are kept in a sugar solution, they will absorb the moisture from the solution, becoming plump and rehydrated. The sugar solution will also enhance the sweetness of the apricots and act as a preservative, prolonging their shelf life. However, it's important to consume them in moderation due to the added sugar content.
A copper coin was kept dipped in silver nitrate solution for a hours or dayswhat will happen to the colours of solution?
If a copper coin is dipped in silver nitrate solution for hours or days, the solution will likely turn blue due to the formation of copper(II) nitrate. This reaction occurs as copper from the coin reacts with the silver nitrate in the solution.
Why was theresienstadt kept a secret?
It was a kept a secret because it was a meeting to discuss what they were going to do to the Jews and the " The Final Solution " was a code name for the extermination of the Jews
How long can grill shrimp be kept for leftovers?
a couple days
What will happen when red blood cells are kept in 10 percent glucose solution?
When red blood cells are kept in a 10% glucose solution, water will flow out of the cells due to osmosis, causing them to shrink and become crenated. This is because the solution is hypertonic compared to the inside of the red blood cells.
