Synthesis of barium permanganate

Preparation of barium permanganate

Preparation of barium permanganate

Preparation of barium permanganate

A mixture of 50 g of potassium permanganate and 50 g of barium nitrate in 500 ml of distilled water is heated with efficient mechanical stirring. A 1-liter Erlenmeyer flask is used to allow for subsequent frothing. When the temperature of the solution reaches about 95° C, 100 g of barium hydroxide 8-hydrate are added in small portions over a period of 15 minutes. Heating and stirring are maintained throughout the addition. The solution is now boiled with vigorous stirring for two to three hours longer; water is added periodically to keep the volume constant. The hot liquid should have only a relatively faint purple color at this point. The mixture is filtered hot by suction through hardened paper and any purple-black product remaining in the reaction flask is transferred to the suction funnel with hot water. After washing with about 200 ml more of hot water, the solid is drained well and dried at 100° C. The mass is suspended and heated to 60 ° C and chlorine is passed in for one-half hour. Five grams of Celite are added and the purple solution is suction-filtered through fritted glass or asbestos. The clear filtrate is evaporated to crystallization on the steam bath and several crops of barium chloride are removed in this way. These should be washed with a very small amount of ice water and the washings added to the mother liquor which is finally evaporated to dryness. The crude residue is a mixture of barium permanganate with barium chloride and it must be analyzed as follows: 150 mg of the product are dried at 105-120° C, weighed out to the nearest 0.001g, dissolved in 250 ml of water at 85° C, and 10ml of 9M sulfuric acid are then added. The solution is titrated hot with N/10 standard sodium oxalate to the disappearance of the permanganate color.

1ml of N/10 sodium oxalate = 0.00375 g of Ba(MnO4)2

After the percentage of barium chloride in the crude product has been determined by difference, it may be removed by metathesis with silver sulfate in calculated amount.

Removing by-product barium chloride

Removing by-product barium chloride

The impure material is digested in 250ml water with the required amount of silver sulfate at 60° C until the precipitate appears well settled (about 1 hour). After being cooled, filtered through asbestos, and evaporated, the clear filtrate is evaporated to dryness on the steam bath. It is placed in a dessicator to remove final traces of moisture. The yield of barium permanganate is 84 g. The product is contaminated with a little barium carbonate.

Inorganic laboratory preparations, by G. G. Schlessinger, 35-26, 1962

Preparation of barium permanganate

Preparation of barium permanganate

40 g of manganese dioxide are ground in a large mortar with 42 g of barium nitrate and 125 g of anhydrous barium hydroxide. The mixture is heated gently at first in an iron dish over a burner and then, with rising temper ature, is fused to a dry green mass while being stirred with an iron rod. The material is chopped out of the dish and finely pulverized in a mortar. It is then stirred into one liter of boiling water, kept at 100° C, for five minutes, and suction-filtered hot. The filtrate containing excess soluble barium salts is discarded and the moist cake of barium manganate is suspended in 300 ml of water. As carbon dioxide decomposes the green manganate only very slowly in water, even at 100° C chlorine must be used for the oxidation. The suspension is heated to 60 ° C and chlorine is passed in for one-half hour. Five grams of Celite are added and the purple solution is suction-filtered through fritted glass or asbestos. The clear filtrate is evaporated to crystallization on the steam bath and several crops of barium chloride are removed in this way. These should be washed with a very small amount of ice water and the washings added to the mother liquor which is finally evaporated to dryness. The crude residue is a mixture of barium permanganate with barium chloride and it must be analyzed as follows: 150 mg of the product are dried at 105-120° C, weighed out to the nearest 0.001g, dissolved in 250 ml of water at 85° C, and 10ml of 9M sulfuric acid are then added. The solution is titrated hot with N/10 standard sodium oxalate to the disappearance of the permanganate color.

1ml of N/10 sodium oxalate = 0.00375 g of Ba(MnO4)2

After the percentage of barium chloride in the crude product has been determined by difference, it may be removed by metathesis with silver sulfate in calculated amount.

Removing by-product barium chloride

Removing by-product barium chloride

The impure material is digested in 250ml water with the required amount of silver sulfate at 60° C until the precipitate appears well settled (about 1 hour). After being cooled, filtered through asbestos, and evaporated, the clear filtrate is evaporated to dryness on the steam bath. It is placed in a dessicator to remove final traces of moisture. The yield is variable, depending on the purity of the manganese(IV) oxide and the success of the oxidative fusion, but it should be 30-50 g.

Inorganic laboratory preparations, by G. G. Schlessinger, 35-26, 1962

IUPAC Name

barium(2+);dipermanganate

InChI

InChI=1S/Ba.2Mn.8O/q+2;;;;;;;;;2*-1

InChI Key

YFFSWKZRTPVKSO-UHFFFAOYSA-N

Canonical SMILES

[O-][Mn](=O)(=O)=O.[O-][Mn](=O)(=O)=O.[Ba+2]

Depositor-Supplied Synonyms

BARIUM PERMANGANATE, Barium manganate(VII), 7787-36-2, Permanganic acid, barium salt, Permanganate barico [Spanish], HSDB 397, Permanganate de baryum [French], EINECS 232-110-1, UN1448, Permanganic acid (HMnO4), barium salt, barium(2+) dipermanganate, Bariumpermanganate, Permanganate barico, Permanganate de baryum, UNII-YQV1TGU8UP, YQV1TGU8UP, AC1L2NJE, AC1LANI7, CTK5E5083, YFFSWKZRTPVKSO-UHFFFAOYSA-N, barium bis[oxido(trioxo)manganese], BARIUM(2+) ION DIPERMANGANATE, IN001333, Barium permanganate [UN1448] [Oxidizer], LS-102448, Barium permanganate [UN1448] [Oxidizer], Permanganic acid(HMnO4), barium salt (8CI,9CI)

Removed Synonyms

CID24587

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