How to prepare a 40 ppm potassium permanganate solution

ppm concentration The concentration expressed as the parts per million mass of the solute to the mass of the total solution, also known as the parts per million concentration. ppm is parts per million or parts per million, and in pesticide applications, it was often used to indicate the concentration of spraying solution, that is, the number of parts of pesticide active ingredient in one million parts of spraying solution. According to international regulations, the ppm rate is no longer expressed in ppm, but in micrograms, milliliters, or grams.

The formula for converting between parts per million and percentages is:

Parts per million percentage x 10 000

That is, multiplying the percentage by 10,000 is the millionth, and conversely, the millionth divided by 10,000 is the percentage.

After you have explained the ppm, you can prepare the solution yourself.

ppm concentration.

With the solute mass to the parts per million ratio of the mass of the solution, ppm is the parts per million or parts per million, grams of potassium permanganate dissolved in 1,000,000 grams of water.

That's the proportion.

Equal to grams of potassium permanganate in 1 ton of water.

Because the amount of potassium permanganate is very small, it is negligible in the mass of the solution.

August 19th.

4kmNO4 + 2H2O ====4mNO2 (precipitation) + 4KOH + 3O2 (gas).

Acidified potassium permanganate solution can only be kept in a dark place and can slow down the reaction.

Why does it turn brown so quickly, because there is manganese dioxide generated, which may cause the solution to change color.

is brown. The above is purely personal speculation.

It should be on August 19th.

18:51 Modified by the author.

Potassium permanganate solutionMethod of preparation:

Weigh the solid KMNO4 on a scale and place it in a 1000 ml beaker.

medium, add 500 ml of distilled water.

Heat and boil and cool), boil for about 1 hour, add a certain amount of distilled water in the middle, to keep the volume basically unchanged, and use a microporous glass funnel or glass wool after standing and cooling.

Funnel filtration, filtrate into a brown fine-mouthed bottle, labeling, one week later.

Calibrate and save for later use.

The KMno4 solution was calibrated with Na2C2O4 solution

Accurately weigh a copy of the reference substance Na2C2O4 and place it in a 250ml Erlenmeyer flask.

, add about 30ml of water to it to dissolve, then add 3mol·l-1H2SO415ml, cover the lid, heat to 75 85 (the temperature at the beginning of steaming) on the asbestos iron wire, take 25ml each time, three times in parallel, and titrate with potassium permanganate solution while hot.

The reaction speed is slow at the beginning of the titration, and after the mn2+ is produced in the solution, the titration speed can be appropriately accelerated until the solution is reddish and lasts for half a minute without fading. Titrate three times in parallel, and the KmNO4 concentration is calculated based on the mass of Na2C2O4 and the volume of the consumed KMnO4 solution. The other two Na2C2 O4 solutions were titrated in the same way, with relative mean difference.

should be within. PrecautionsDistilled water often contains a small amount of the original substance, which reduces KMno4 to Mno2·NH2O. Commercially available potassium permanganate contains fine powdered mNO2· NH2O can accelerate the decomposition of KMno4, so the KMno4 solution is usually boiled for a period of time, and after cooling, it needs to be placed for 2 3 days to make it fully functional, and then the precipitate is filtered and removed.

The aqueous solution of potassium permanganate releases oxygen slowly, and the soaking time must reach 5 minutes before it has the ability to sterilize for forest typePotassium permanganate solution can be used to wash wounds; It can also be used to disinfect tableware and tea utensils such as bowls and chopsticks, teacups, etc.

and fruits. When using potassium high manganese to disinfect fruits, tableware and other items, first soak the items to be disinfected in potassium permanganate solution for a few minutes, and then rinse them with water.

At room temperature, the reaction rate between KMno4 and C2O42- is slow, so heating increases the reaction rate. However, the temperature should not be too high, if the temperature exceeds 85, some H2C2O4 will decompose.

1 g potassium permanganate plus 5 l water.

Potassium permanganate disinfectant

The chemical name is potassium permanganate (KMNO), the common name is gray manganese oxygen, PP powder, potassium permanganate is one of the salts of potassium permanganate.

The product is used as a disinfectant, deodorant, and water purification agent. Potassium permanganate is a strong oxidant, which releases new ecological oxygen and kills bacteria in case of organic matter, and has a strong bactericidal power, but it is easy to be weakened by organic matter, so the effect is superficial and not lasting. It can be deodorized and disinfected, used for sterilization and disinfection, and has an astringent effect.

The solution is used to clean ulcers and abscesses, the solution is used to gargle or sitz bath, the solution is used to disinfect fruits, etc., and it is soaked for 5 minutes. At the same time as oxidation, potassium permanganate is reduced to form manganese dioxide, which combines with proteins to form protein salt complexes, which have astringent effects on both manganese ions and permanganese ions. It is also used as an oxidizing agent in the analysis of certain metal ions.

It is also used as a bleaching agent, a toxic gas absorber, a carbon dioxide essence preparation, etc.

Method

Pyromanganese ore is eutectic with potassium hydroxide to obtain potassium manganate, and then electrolyzed in alkaline solution to prepare. It can also be prepared by potassium hydroxide, manganese dioxide and potassium chlorate to obtain potassium manganate, and then chlorine gas or carbon dioxide or ozone in its solution.

The chemical equation for the preparation of oxygen from potassium permanganate: 2kmNO4 = = K2mNO4 + MNO2 + O2

The chemical equation for the reaction of potassium permanganate with concentrated hydrochloric acid: 2kmNO4 + 16HCl = 2KCl + 2mnCl2 + 5Cl2 + 8H2O

Potassium permanganate is the most common chemical, and it is also essential in outdoor sports. Purify water, make marking, debridement, anti-inflammatory and detoxification. Rub and make a fire for 30 seconds, don't worry if you are trapped in the mountains.

1 g potassium permanganate, 5000 g of water.

Prepare it in this ratio.

Similarly: 100 mg potassium permanganate, 500 g water.

10 mg potassium permanganate, 50 g water.

。See how much you need.

Generally, the concentration of potassium permanganate is 1:5000, that is, the ratio of potassium permanganate to water is 1:5000

In layman's terms, it is a basin of water, and after adding potassium permanganate, the clear water can have a little color. Do not concentrate too much! After washing, take care to keep the local dry.

The mass ratio of potassium permanganate to water is 5 95 = 1 19

For example, to prepare 1000 grams of 5% potassium permanganate solution, then the mass of potassium permanganate is 1000 1 (1 + 19) = 50 grams, the mass of water is 1000 19 (1 + 19) = 950 grams, that is, 50 grams of potassium permanganate can be stirred and water is added at the same time to set the weight of 1000 grams.

Anode: 2mNO42-a2E- =2mNO4-

Cathode: 2h2o deca2e- =2oh-decah2

Total reaction: 2k2mNO4 + 2H2O = electrolysis = 2kmNO4 + 2koH + H2

Question 2: How to prepare 1:5000 potassium permanganate solution 1 gram of potassium permanganate, 5000 grams of water.

Prepare it in this ratio.

Similarly: 100 mg potassium permanganate, 500 g water.

10 mg potassium permanganate, 50 g water.

See how much you need.

Question 3: How to prepare 1% potassium permanganate solution? 1 gram of potassium permanganate dissolved in 1000 grams of water, approximately.

Usually used for disinfection, 1-5% dissolving liquid is prepared, which is not easy to measure accurately. You can put in the required amount of solution, first fill the container with water, then put in a very small amount, stir, until pink. It can be used for disinfection, foot soaking to cure athlete's foot, etc.

I also sometimes use it for disinfection when propagating plants by cuttings.

Question 4: What should be paid attention to in the preparation of potassium permanganate solution Precautions for the preparation of potassium permanganate solution:

The heating temperature should not be too high, if it exceeds 90, it is easy to cause decomposition

The color is darker, and the highest line along the liquid level should be used as the standard for reading;

Endpoint judgment: reddish for half a minute without fading is the end.

Categories: Education Science >> Entrance Examination >> College Entrance Examination.

Problem description:1How does potassium permanganate differ in its oxidation number change when it reacts in a neutral, weakly alkaline or strongly alkaline solution?

2.What are the purposes of adding acid, heating and controlling the titration speed during the titration of Na2C2O4 with potassium permanganate?

3.Can you suggest a method for calibrating the concentration of potassium permanganate?

Analysis: 1. Neutral: +7-+4;Alkaline: +7 - +6;Acidity: +7 - +2.

2. Add acid to enhance the oxidation of potassium permanganate, and ensure that its reduction products are +2 valence.

Heating: Increases the reaction rate. (A certain reaction rate is required during the titration, otherwise it will affect the judgment of the endpoint and the accuracy of the results.)

Control the titration speed: that is, the beginning of the impulse can not be too fast, at the beginning despite the high temperature, the reaction rate is still not fast, then it is necessary to drop a drop, shake vigorously until the color fades, before you can start to drop the second drop, otherwise it will cause permanganate ions to decompose under the high temperature of strong acid, affecting the measurement results. Later, due to the generation of Mn2+ ion catalysis, the titration speed can be accelerated.

3. Weigh a certain amount of Na2C2O4 reference reagent, add acid, titrate with potassium permanganate until the solution is reddish, and calculate the potassium permanganate concentration according to the amount of potassium permanganate consumed.