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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.
Why does the part of leaf inside the bottle containing potassium hydroxide solution not get carbon dioxide?
The leaf inside the bottle containing potassium hydroxide solution does not receive carbon dioxide because the potassium hydroxide absorbs the carbon dioxide present in the air. This creates a carbon dioxide-free environment inside the bottle, preventing the leaf from undergoing photosynthesis.
How do you prepare iodine solution?
To prepare iodine solution, dissolve iodine crystals in a mixture of water and potassium iodide (KI). The ratio of iodine to KI will determine the concentration of the solution. The solution should be stored in a dark bottle to prevent degradation from light exposure.
How chlorine is calculated by using chlorotex reagent?
Chlorotex reagent usually contains DPD (N,N-diethyl-p-phenylenediamine) which reacts with free chlorine to form a pink color. The concentration of chlorine in a sample can be determined by measuring the intensity of the pink color using a spectrophotometer or a colorimeter and comparing it to a standard curve. The higher the intensity of pink color, the higher the concentration of free chlorine in the sample.
Do bottle caps attract to magnets?
Most bottle caps are made of steel or aluminum, which are not magnetic materials. So, bottle caps themselves do not attract to magnets. Some bottle caps may have a plastic lining that also would not be magnetic.
Uses of reagent bottle?
Reagent bottles are commonly used in laboratories to store and dispense chemicals, solvents, and reagents. They help to ensure the safe handling and storage of these substances, as well as enable accurate measurements during experiments. Reagent bottles are also used for the preparation of solutions, mixing of reagents, and as a container for samples.
What is the difference of dropping bottle and reagent bottle?
The reagent bottle is not used for dropping, having only a common stopper.
Why is it permissible to use a wet bottle when first obtaining your KMnO4 solution?
It is permissible to use a wet bottle when first obtaining your KMnO4 solution because the potassium permanganate (KMnO4) is not affected by water and will still dissolve properly in the solution.
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.
How do you pick up a reagent bottle?
To pick up a reagent bottle, ensure your hands are clean and dry. Grasp the bottle around its body or neck, being careful not to touch the lid or the inside of the bottle to maintain the purity of the reagent inside. Lift the bottle carefully to prevent spills or breakage.
Can a pipet be placed in a reagent bottle?
Yes, a pipet can be placed in a reagent bottle to withdraw specific volumes of the reagent as needed. It is important to ensure that the pipet tip does not touch the sides or bottom of the bottle to prevent contamination and maintain accuracy in volume measurement.
A dry and clean spatula is used to spoon out small amount of solid from a reagent bottle?
Using a dry and clean spatula helps prevent contamination of the reagent. Spooning out small amounts of solid ensures accurate measurement and avoids waste of reagent. Remember to close the reagent bottle tightly after use to maintain its integrity.
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 best way to obtain 5ml of liquid reagent from a large reagent bottle?
Use a graduated pipette or syringe to measure and transfer 5ml of liquid reagent from the large reagent bottle. Make sure to carefully handle and dispense the reagent to avoid spills and contamination.
What is a reagent bottle used for?
used to utilize chemicals
What is the use reagent bottle in science apparatus?
yes
To remove 0.25 gram of a solid material from a reagent bottle one would use a what?
A spatula would be used to remove 0.25 grams of a solid material from a reagent bottle.
