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Why solutions of potassium permanganate are stored in dark reagent bottle?
Wiki User
∙ 11y ago
Under sunlight, permanganate solution will decompose to give MnO2 and O2
ie 2KMnO4(aq)→K2MnO4(aq)+MnO2(aq)+O2(g)
As such, brown bottles are used to cut off sunlight.
Wiki User
∙ 11y ago
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Why pottasium permanganate solution kept for few days?
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.
How chlorine is calculated by using chlorotex reagent?
Most of the Chlorotex bottle's has chart on their label, which shows the color appeared by mixing sample and chlorotex, versus concentration.
Why does the part of leaf inside the bottle containing potassium hydroxide solution not get carbon dioxide?
i don`t no
Why is it not advisable to use a ground glass stopper for a reagent bottle containing sodium hydroxide solution?
Over time, the sodium hydroxide will react with the smidges of carbon dioxide in air to produce sodium carbonate, the white, crusty powder that you find around the rim of plastic capped stock bottles (for example). This powder will either prevent the ground glass stopper from sealing properly and exposing the contents to more air, or will in fact cement the ground glass stopper in the bottle, and make it impossible to remove.
Is hurricane and tornado in a bottle the same thing?
If you mean a hurricane in a bottle then yes, a hurricane in a bottle and a tornado in a bottle are the same thing. In shape, however, the vortex bears more resemblance to a tornado than a hurricane.
What is the difference of dropping bottle and reagent bottle?
The reagent bottle is not used for dropping, having only a common stopper.
Uses of reagent bottle?
It is a heavy glass bottle (unlikely to break or react with the reagent chemicals) used to store moderate amounts of laboratory chemicals (reagents)
What is reagent bottle and how is used?
used as a container where you put chemicals that can't be thrown in the sink.
Why should screw cap of a reagent bottle be placed bottom up on the table?
If the cover of a reagent bottle is placed on a table with the bottom down, it can pick up material from the table which would contaminate the contents of the reagent bottle after the cap is put back on the bottle.
A dry and clean spatula is used to spoon out small amount of solid from a reagent bottle?
This is to prevent contamination of the remaining reagent in the bottle.
Why should the spatula used for spooning solid chemical from a reagent bottle be clean and dry?
So you don't get water, dirt or other contaminants in the reagent bottle. The reagent bottle should contain chemicals that are as pure as possible. If each person put a dirty spatula in the bottle, the reagent bottle would very quickly accumulate all kinds of junk, ruining the chemicals inside or causing hazardous chemical reactions.
What type of bottle is used for storing acids and bases?
A Reagent Bottle.
What is the specific use of a medium sized reagent bottle?
Your question supplies its own answer, though you may need to ensure the bottle's material will withstand the intended reagent.
What is the function of a reagent bottle in laboratory apparatus?
Reagent bottles are containers made of glass or plastic, and are closed by special caps or stoppers, and are intended to contain chemicals in liquid or powder form for laboratories and stored in cabinets or on shelves.
What is the use reagent bottle in science apparatus?
yes
What is a reagent bottle used for?
used to utilize chemicals
How do you remove fine solid powder from the reagent bottle?
To remove the fine solid powder from the reagent bottle used clean, dry spatula and transferred to a clean, dry watch glass or poured from a bottle by slightly tipping and then rotating the bottle.
