How to extract iodine elemental extraction and oxidation method

Both can be used;

After adding and mixing, transfer to the separating funnel, add plug and shake, take a darker layer when separating, take the upper layer with benzene, remove the lower layer with carbon tetrachloride, and then heat and evaporate the solvent in a water bath (because iodine is easy to sublimate, a water bath is needed) to obtain elemental iodine.

Benzene or carbon tetrachloride can be used, and the difference is in the organic layer is above or below.

After extracting the liquid, the lower layer is released through the piston and the upper layer is poured out through the mouth of the funnel, which is the difference.

Carbon tetrachloride can be ,,, stratified by different densities after extraction! The lower layer is iodine, which can be released from below with a separating funnel! Benzene ,,, forgot about density!! The reaction will be but small, and the general questions are not considered!

Add CCL4

Then open the funnel and let the CCL4 flow into the beaker, the water remains in the funnel, and the iodine is in the beaker Dissolved in the CCL4.

Add carbon tetrachloride, mix with iodine saturated aqueous solution, pour it into the separating funnel, let it stand for a period of time (the density of carbon tetrachloride is greater than water) open the funnel clamp, and the carbon tetrachloride dissolved in iodine flows out.

Add carbon tetrachloride and benzene will do.

After separating, it is distilled and the carbon tetrachloride and benzene are distilled away, leaving behind the iodine element.

Both. After sufficient shaking and standing, the liquid is separated, and then evaporated.

You can use either one, because they will be stratified after extraction, with carbon tetrachloride water in the upper layer, benzene vice versa, and then separate with a separating funnel.

Summary. Kiss will be happy to answer your <>

The extraction of iodine elemental extraction oxidation method is to add an appropriate amount of 40% NaOH solution drop by drop to the iodine carbon tetrachloride solution, and shake while adding until the carbon tetrachloride layer is not red. Iodine reacts to produce I- and I3 into the water. (The equation is 3i2+6oh-=5i-+io3-+3h2o) Divide the liquid, transfer the water layer into a small beaker, and acidify with 45% sulfuric acid dropwise, which can regenerate iodine element.

Because the solubility of iodine element in water is very small, it can be precipitated. (The equation is 5i-+io3-+6h+=3i2+3h2o) is filtered to obtain iodine crystals. <>

<> extraction of iodine elemental extraction oxidation method.

Kiss will be happy to answer your <>

The iodine elemental extraction and oxidation method is to add an appropriate amount of 40% NaOH solution dropwise to the iodine carbon tetrachloride solution, and shake while adding until the carbon tetrachlorophoric potato layer is not red. Iodine reacts to produce I- and I3 into the water. (The equation is 3i2+6oh-=5i-+io3-+3h2o) Divide the liquid, transfer the water layer into a small beaker, and acidify with 45% sulfuric acid dropwise, which can regenerate iodine element.

Because the solubility of iodine element in water is very small, it can be precipitated. (The equation is 5i-+io3-+6h+=3i2+3h2o) is filtered to obtain iodine crystals. <>

<> experimental procedure Take 5g of dried kelp with a scale, use a brush to wet the attachment on the surface of the kelp (do not wash it with water), moisten it with alcohol, and put it in a crucible. The surface principle of kelp is that there are many white attachments, and it is not washed with water to prevent the iodide in the kelp from being dissolved in water and lost. Moistening with alcohol is to allow the kelp to burn sufficiently.

Place the crucible on the mud triangle, use an alcohol lamp to make a search shed and heat the kelp until it becomes ash, stop heating, naturally cool the dried kelp and burn it into white ashes to convert organic iodide into inorganic iodide Transfer the sea pure ash to a small beaker, add 20ml of distilled water, stir, boil for 2 3min to dissolve the soluble matter and cool it. When the kelp ash is boiled, the solution is turbid so that the iodine ions enter the solution Filter, collect the filtrate, discard the filtrate to obtain an iodine ion solution 1ml of chlorine water is dropped into the drain base of the filtrate, and shake. After dropping, the solution changes from colorless to brown equation:

Cl2+2I-=2Cl-+I2 Transfer the oxidized solution to a separating funnel, add 2mlCCL4 to it, shake, and let stand. After the addition of CCL4, the solution is stratified, the colored layer is in the upper layer, and the solution is still layered in the lower layer after shaking, and the solubility of iodine element in organic solvents is greater than that in water.

Extraction of iodine from kelp.

Objective: To extract iodine from kelp.

Experimental principle]: The iodine ions are oxidized into iodine elements by oxidant, and then tested with starch.

2ki +Cl2== I2 +2kCl I2 encounters starch and turns blue.

Instruments needed for the experiment]: balance, tweezers, scissors, iron stand, alcohol lamp, crucible, crucible pliers, mud triangle, glass rod, separating funnel.

Selection of experimental drugs]: kelp, chlorine water, starch solution, carbon tetrachloride.

Experimental Procedures and Phenomena]:

Protocol x09 Phenomenon x09 Explanation and Reaction Equation.

Weigh 5g of dried kelp, use a brush to remove the attachment on the surface of the kelp (do not wash with water), moisten it with alcohol, and put it in a crucible. X09 kelp surface principle: there are more white attachments X09 is not washed with water to prevent the iodide in the kelp from being dissolved in water and lost. Moistening with alcohol is to allow the kelp to burn sufficiently.

Place the crucible on the mud triangle, heat the kelp with an alcohol lamp until it becomes ash, stop the heating, and cool it naturally. Dried kelp burned to white ashes. Converts organic iodide into inorganic iodide.

Transfer the kelp ashes to a small beaker, add 20ml of distilled water, stir, boil for 2 3min to dissolve the solubles and cool. When X09 kelp ash is boiled, the solution is turbid, allowing iodine ions to enter the solution.

Filtration, collection of filtrate, discarding of filter residue, to obtain filtrate, to obtain iodine ion solution.

Add 1 ml of chlorine water to the filtrate and shake. After dropping, the solution changes from colorless to brownish-yellow x09 equation: Cl2+2I-=2Cl-+I2

The oxidized solution is transferred to a separating funnel, 2 ml of CCL4 is added to it, shaken, and let stand. After the addition of CCL4 to X09, the solution was stratified, the colored layer was in the upper layer, and the solution was still stratified after shaking.

The colored layer is in the lower layer, and the color, indicating that the solubility of iodine elements in organic solvents is greater than in water.

Discussion and exchange] 1. What is the function of burning? What other methods can be used to treat kelp other than burning?

2. In the fifth step, in order to oxidize i- to iodine element, can chlorinated water be added in excess dropwise? What other reagents can I use? How to test for iodine production?

3. How is iodine transformed during the whole experiment?

4.Is it possible to purify iodine by taking advantage of its sublimation properties? If so, how?

How to extract iodine from carbon tetrachloride solution of iodine --- reverse extraction:

Add an appropriate amount of 40 NaOH solution drop by drop to the iodine-based carbon tetrachloride solution, and shake while adding until the carbon tetrachloride layer is no longer red. Iodine reacts to produce I- and I3 into the water.

The equation is 3i2+6oh- = 5i- + io3-+3h2o).

Divide the liquid, transfer the aqueous layer into a small beaker, and add 45% sulfuric acid dropwise to acidify, which can regenerate iodine element. Because the solubility of iodine element in water is very small, it can be precipitated.

The equation is 5i-+ io3-+ 6h+ =3 i2+3h2o).

Filtered to obtain elemental iodine crystals.

There is some potassium iodate in the seagrass or kelp, which is added to ethanol and burned to ashes. Then add ethanol to the solution there are iodine ions I, oxidized with a small amount of oxidant (such as manganese dioxide) under acidic conditions, you can get some iodine, add some liquid paraffin in it, it will dissolve some iodine, distill the upper purple solution, and finally crystallize some iodine. To produce a large amount of iodine, it is necessary to directly oxidize and dissolve it with something containing iodine ions, and finally crystallize it.

If you just want to make it simple, you can extract it from iodine tincture with organic solvents.

Iodine is not very non-metallic and generally difficult to react with water. The solubility of iodine in water is not large, and if iodine water is distilled, the water and iodine in iodine water may be evaporated: water will be evaporated, and then condensed, and iodine is also easy to sublimate, some will be evaporated, basically can not get elemental iodine, of course, if there is time and a large amount of iodine water, theoretically it also exists, but the implementation is not strong, after all, the carbon tetrachloride solution with a large concentration of iodine is not better?

Carbon tetrachloride extracts iodine in iodine water, carbon tetrachloride and water are stratified, iodine elemental is dissolved in carbon tetrachloride, carbon tetrachloride layer is in the lower layer, water is in the upper layer, and then the liquid is separated, carbon tetrachloride is released from the lower end of the separator funnel, water is poured out from the upper mouth, the carbon tetrachloride solution dissolved with iodine is placed in the beaker, carbon tetrachloride is volatile, and finally the iodine element is left in the beaker.

Why can carbon tetrachloride be used to extract iodine from iodine water?

1) Carbon tetrachloride is insoluble in water and cannot react.

2) The solubility of iodine in carbon tetrachloride is greater than that in the original solvent.

Summary. Yes, the extraction of iodine in iodine water belongs to solid-liquid extraction.

Yes, the extraction of iodine in iodine water belongs to solid-liquid extraction.

Can you add, I don't quite understand it.

Extraction of iodine in iodine water belongs to solid-liquid extraction. Solid-liquid extraction refers to the extraction of solutes from a solid substance into the liquid phase. In the case of iodine in iodine water, the solute is iodine, and the solid substance is the iodine water volcanic chain, and the extraction process is to extract iodine from iodine water and transfer it to the liquid phase, so it belongs to solid-liquid extraction.

Iodine in iodine water can be extracted by acidification, reduction or evaporation. The acidification reduction method often uses sodium sulfite to reduce the iodine into diiodide ions and transfer it to an organic solvent. The evaporation method is to evaporate the iodine dry water to a certain concentration, so that the iodine is precipitated from the iodine water, and then the precipitated iodine is extracted with an organic solvent.

Summary. A: It does not belong to solid-liquid extraction.

Solid-liquid extraction is a separation technique that separates certain components of a mixture from others. The iodine in iodine water is a solvent dissolved in water and does not belong to solid-liquid extraction. Workaround:

The iodine in iodine water can be extracted by precipitation. Precipitation is a commonly used separation technique that separates solutes dissolved in solvents from solvents. The specific steps are as follows:

1.Add a certain amount of ammonium sulfate to iodine water to precipitate iodide ions; 2.The sediment is filtered with filter paper to collect the sediment; 3.

The collected sediment is washed with hot water to remove residual ammonium sulfate; 4.The washed precipitate is dried to obtain iodine ions. Precipitation is a simple and effective separation technique that can effectively separate the solutes dissolved in the solvent from the solvent and can therefore be used to extract iodine from iodine water.

A: It does not belong to solid-liquid extraction. Solid-liquid extraction is a separation technique that separates certain components of a mixture from others.

The iodine in iodine water is a solvent dissolved in water, and does not belong to solid-liquid closed-cavity extraction. Solution: The iodine in iodine water can be extracted by precipitation.

Precipitation is a commonly used separation technique, which can separate the solute dissolved in the dissolved acre agent from the solvent. The specific steps are as follows:1

Add a certain amount of ammonium sulfate to iodine water to precipitate iodide ions; 2.The sediment is filtered with filter paper to collect the sediment; 3.The sediment collected in the sedan state is washed with hot water to remove the residual ammonium sulfate; 4.

The washed precipitate is dried to obtain iodine ions. Precipitation is a simple and effective separation technique that can effectively separate the solutes dissolved in the solvent from the solvent and can therefore be used to extract iodine from iodine water.

Can you tell us more about that?

A: It does not belong to solid-liquid extraction. Solid-liquid extraction refers to a technology that separates solid substances from liquids, while iodine in iodine water is a substance dissolved in liquids, which is not a solid substance, so it does not belong to solid-liquid extraction.

Solid-liquid extraction is a commonly used separation technique that separates the useful components of a mixture to obtain a pure substance. Its principle is to use the different solubility of different substances in the solvent to slow grind, by changing the polarity of the solvent, so that the same substance is dissolved in different solvents, so as to achieve the purpose of separation. Solid-liquid extraction has a wide range of applications, and can be used to separate organic matter, inorganic matter, protein, nucleic acid, etc., and is a very effective separation technology.

with the method of extraction. First, take the saturated solution of iodine, pour it into the separating funnel, and add carbon tetrachloride to seal it. ** Allow the liquid to come into full contact and then emit the gas. After the liquid is stratified at rest, it is divided into a carbon tetrachloride solution of iodine and water. Finally, carbon tetrachloride is evaporated.

Extraction, also known as solvent extraction or liquid-liquid extraction, also known as extraction, is a unit operation that uses the different solubility of components in a system to separate a mixture in a solvent. That is, it is a method of transferring solute substances from one solvent to another solvent by using the difference in solubility or partition coefficient of substances in two immiscible (or slightly soluble) solvents. It is widely used in chemical, metallurgical, food and other industries, and is commonly used in petroleum refining industry.

In addition, the operation of separating the two immiscible liquids after extraction is called dispensing.

Solid-liquid extraction, also known as leaching, uses solvents to separate components in a solid mixture, such as sugars in sugar beets with water; Soybean oil in soybeans is soaked with alcohol to increase oil yield; Extracting the active ingredient from Chinese medicine with water to make a flow extract is called "leaching" or "leaching".

Although extraction is often used in chemical experiments, its operation does not cause a change in the chemical composition (or chemical reaction) of the extracted skin, so the extraction operation is a physical process.

Extraction is one of the methods used in organic chemistry laboratories to purify and purify compounds. By extraction, the desired substance can be extracted from a solid or liquid mixture.