Potassium permanganate test

Potassium permanganate test. Dissolve 0 -2 g. or 0 -2 ml. of the substance in 2 ml. of water or in 2 ml. of acetone (which gives a negative test with the reagent), and add 2 per cent, potassium permanganate solution dropwise. The test is negative if no more than 3 drops of the reagent are decolourised. 

Alphaeucaine hydrochloride gives a yellow precipitate when 5 cc. of a 1 per cent, solution are treated with three drops of a 5 per cent, solution of chromic acid. Cocaine hydrochloride does not. Betaeucaine hydrochloride when rubbed with dry mercurous chloride and then moistened with alcohol yields no color, cocaine hydrochloride when similarly treated turns grayish black. Holocaine hydrochloride gives in aqueous solution a violet precipitate with calcium hypochlorite, cocaine hydrochloride does not. Cocaine and procaine are distinguished by the potassium permanganate test (see Procaine Hydrochloridum). 

The unsaturated character of compounds which contain carbon atoms joined by a triple bond is shown by their behavior with bromine and with a solution of potassium permanganate. Tests for such compounds are carried out in the manner described... 

Standard specification for tricresyl phosphate contains requirements for apparent specific gravity, color according to platinum-cobalt scale, potassium permanganate test, unsaponifiable matter, water content, and acidity. ... 

Unsaturation. Consult the preliminary tests to ensure that the compoimd does not contain a centre of imsaturation. If necessary, repeat the bromine and potassium permanganate tests. Note that in a few instances bromine water and bromine in carbon tetrachloride are not decolourized at room temperature despite the olefinic character of the add, e.g. maleic add. 

Potassium Permanganate Test for Alkene Donble Bonds... 

Does not give Unsaturation Test with alkaline potassium permanganate (distinction from cinnamic acid, see below). 

Test the solution so obtained for unsaturation by adding cold 1 per cent, potassium permanganate solution a drop at a time. The immediate disappearance of the purple colour and the formation of a brown turbidity indicates the presence of a double bond Baeyer a test). It must be noted that many substances, not unsaturated, decolourise warm acid or neutral potassium permanganate solution. 

The fermentation-derived food-grade product is sold in 50, 80, and 88% concentrations the other grades are available in 50 and 88% concentrations. The food-grade product meets the Vood Chemicals Codex III and the pharmaceutical grade meets the FCC and the United States Pharmacopoeia XK specifications (7). Other lactic acid derivatives such as salts and esters are also available in weU-estabhshed product specifications. Standard analytical methods such as titration and Hquid chromatography can be used to determine lactic acid, and other gravimetric and specific tests are used to detect impurities for the product specifications. A standard titration method neutralizes the acid with sodium hydroxide and then back-titrates the acid. An older standard quantitative method for determination of lactic acid was based on oxidation by potassium permanganate to acetaldehyde, which is absorbed in sodium bisulfite and titrated iodometricaHy. 

The MauIg Color Reaction. The procedure for this test consists basically of three sequential treatments of lignified material with 1% potassium permanganate, 3% hydrochloric acid, and concentrated ammonium hydroxide. A red-purple color develops for hardwoods and a brown color... 

Two oxidants commonly used are chlorine and potassium permanganate. The Roe chlorine number, the uptake of gaseous chlorine by a known weight of unbleached pulp (ie. Technical Association of the Pulp and Paper Industry (TAPPl) Standard Method T202 ts-66) has been superseded by the simpler hypo number (ie, TAPPl Official Test Method T253 om-86), eg, chlorine consumption in treatment of the pulp with acidified sodium or calcium hypochlorite. 

Aconitine produces an intense tingling sensation when a drop of a solution, 1 in 10,000, is applied to the tip of the tongue. It also gives a characteristic unstable, crystalline precipitate when a few drops of potassium permanganate solution are added to a solution of the alkaloid in dilute acetic acid. The formation of acetic acid when the alkaloid is heated dry, or of benzoic acid when it is hydrolysed by alkali, have also been suggested as identification tests. For the recognition of minute quantities a biological test is probably the best procedure. ... 

SEI f-Test L.4B The amount of arsenic(IIl) oxide in a mineral can be determined by dissolving the mineral in acid and titrating it with potassium permanganate ... 

Self-Test 12.1B Acidified potassium permanganate solution reacts with sulfurous acid, H2SO. (aq), to form sulfuric acid and manganese(II) ions. Write the net ionic equation for the reaction. In acidic aqueous solution, H2S03 is present as electrically neutral molecules and sulfuric acid is present as HS04 ions. 

Barium peroxide had been used instead of potassium permanganate to purify acetic anhydride. Several operations had been carried out and the technicians had realised that this medium gives rise to mild deflagrations. During the last test a very violent detonation took place. It was thought that acetyl peroxide had formed. 

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