Sodium carbonate reaction with

Bulk aluminum may undergo the following dangerous interactions exothermic reaction with butanol, methanol, 2-propanol, or other alcohols, sodium hydroxide to release explosive hydrogen gas. Reaction with diborane forms pyrophoric product. Ignition on contact with niobium oxide + sulfur. Explosive reaction with molten metal oxides, oxosalts (nitrates, sulfates), sulfides, and sodium carbonate. Reaction with arsenic trioxide + sodium arsenate + sodium hydroxide produces the toxic arsine gas. Violent reaction with chlorine trifluoride, Incandescent reaction with formic acid. Potentially violent alloy formation with palladium, platinum at mp of Al, 600°C. Vigorous dissolution reaction in... 

The bulk material may ignite or explode in storage. Traces of water may initiate the reaction. A rapid exothermic decomposition above 175°C releases oxygen and chlorine. Moderately explosive in its solid form when heated. Explosive reaction with acetic acid + potassium cyanide, amines, ammonium chloride, carbon or charcoal + heat, carbon tetrachloride + heat, N,N-dichloromethyl-amine + heat, ethanol, methanol, iron oxide, rust, 1-propanethiol, isobutanethiol, turpentine. Potentially explosive reaction with sodium hydrogen sulfate + starch + sodium carbonate. Reaction with acetylene or nitrogenous bases forms explosive products. 

To hydrolyse an ester of a phenol (e.g., phenyl acetate), proceed as above but cool the alkaline reaction mixture and treat it with carbon dioxide until saturated (sohd carbon dioxide may also be used). Whether a solid phenol separates or not, remove it by extraction with ether. Acidify the aqueous bicarbonate solution with dilute sulphuric acid and isolate the acid as detailed for the ester of an alcohol. An alternative method, which is not so time-consuming, may be employed. Cool the alkaline reaction mixture in ice water, and add dilute sulphuric acid with stirring until the solution is acidic to Congo red paper and the acid, if aromatic or otherwise insoluble in the medium, commences to separate as a faint but permanent precipitate. Now add 5 per cent, sodium carbonate solution with vigorous stirring until the solution is alkaline to litmus paper and the precipitate redissolves completely. Remove the phenol by extraction with ether. Acidify the residual aqueous solution and investigate the organic acid as above. 

A suspension of 17a,21-dihydroxypregna-4,9(ll)-diene-3,20-dione 21-acetate (0.77 g) and iV-bromoacetamide (0.3 g) in anhydrous methylene dichloride (40 ml) is added over 2-3 min with stirring to a mixture of anhydrous hydrogen fluoride (10.19 g), and anhydrous tetrahydrofuran (18 g) in a polyethylene bottle at —80° (acetone-dry ice). After 1 hr at —80° the reaction mixture is kept for a further 1 hr at 0° and then added cautiously to an excess of an ice-cold solution of sodium carbonate. Extraction with methylene dichloride and crystallization from acetone-hexane furnish 9a-bromo-ll -fluoro-17a,21-dihydroxypregn-4-ene-3,20-dione 21-acetate (0.69 g), mp 205-208°, raised by several crystallizations from acetone-hexane to 215-217° [aju 142° (CHCI3) max 240-242 mju (e 15,500). 

Step 1 1-(p-Chlorophenyl)-3-Ethoxy-1 H-lsoindole - Crystalline triethyloxonium boron-tetrafluoride (21 g) (prepared from 23 g of borontrifluoride etherate and 11 g of epichlorohydrin) is dissolved in 100 ml of absolute methylenechloride. 3-(p-Chlorophenyl) phthalimidine (21 g) is added and the reaction mixture is stirred overnight at room temperature. The resulting solution is poured onto 50 ml of saturated Sodium carbonate, extracted with 500 ml of ether and dried. Upon evaporation of the solvent there is obtained crude material which is recrystallized from methylene chloride/hexane (1 1) to yield l-(p-chlorophenyl)-3-ethoxy-1 H-isoindole MP 102° to 103°C. 

Into a 100 mL round bottom flask fitted with a magnetic stirrer, and a condenser were placed 10.09 g (0.08 mol) of 3-cyclohexene-1-carboxylic acid, 12.81 g (0.40 mol) of methanol and 1.56 g (0.016 mol) of concentrated sulfuric acid. The reaction mixture was heated under reflux for 5 hr in an oil bath. After this time, the reaction mixture was diluted with water and then extracted several times with ether. The organic phase was neutralized by washing with a dilute solution of sodium carbonate, then with distilled water and finally dried over anhydrous magnesium sulfate. After filtration,... 

In a one-liter flask fitted with a reflux condenser 31.8 g (0.265 mol) of acetophenone is dissolved in 130 ml of absolute ethanol and 130 ml of dry sulfur-free benzene, and 0.5 g of mercuric chloride and 8 g (0.296 g-atom) of aluminum foil are added. Heating of the mixture initiates a vigorous reaction which is allowed to proceed without external heating until it moderates. Then the flask is heated to maintain reflux until all of the aluminum has dissolved (2 hours). After cooling the reaction mixture is treated with dilute hydrochloric acid and the product is extracted with benzene. The combined organic layers are washed with dilute acid, with a solution of sodium carbonate, and with a saturated solution of sodium chloride they are then dried with sodium sulfate and the solvent is evaporated under reduced pressure. A rapid vacuum distillation affords a fraction at 160-170° at 0.5 mm which, after dissolving in petroleum ether (b.p. 65-110°), gives 18.0 g (56%) of 2,3-diphenyl-2,3-butanediol, m.p. 100-123°. 

The reaction mixture is allowed to cool and is poured into 4 1. of cold water (Note 3). The upper layer is separated and allowed to stand for two hours over about 500 cc. of 5 per cent sodium carbonate solution with frequent shaking or mechanical stirring. This decomposes any excess of acetic anhydride. It... 

Caustic soda, NaOH, is often prepared commercially by the reaction of sodium carbonate, Na2C03, with slaked lime, Ca(OH)2. How many grams of NaOH can be obtained by treating 1 kg of Na2C03 with Ca(OH)2 ... 

This reaction gives high yield of carbon (44-80%) and can be easily scaled. Purifying of the raw material includes treatment of it with sodium carbonate solution with following treatment with acid. Surface area of nanocarbons obtained was 64-500 m2/g, specific electric resistance of powder 0.02-0.07 Ohm.cm. 

The unsymmetrical isomers of trinitrotoluene also give specific reactions with sodium carbonate and with lead oxide. The former also affects the ignition temperatures of the isomers. The corresponding data are tabulated below, in Table 80 (after Brunswig [141]). 

Consider an analytical method involving the titration of hydrochloric acid with anhydrous sodium carbonate to determine the concentration of the acid. The measurements made are mass (weighing out a chemical to make up a solution of known concentration) and volume (dispensing liquids with pipettes and burettes). The reaction between the two chemicals is based on amount of substance - one mole of sodium carbonate reacts with two moles of hydrochloric acid - and the mass of a mole is known (e.g. the formula weight in grams of one mole of sodium carbonate is 105.99). All the measurements are based on either length or mass and are traceable to SI units, so the method is a primary method. 

One hundred grams of crushed ice is added to a solution of 53 g. (0.50 mole) of o-toluidine in 97 g. of concentrated hydrochloric acid. The resulting mixture is diazotized by the addition of a solution of 36 g. (0.52 mole) of sodium nitrite in 60 g. of water. The temperature of the reaction mixture is maintained below 2° during this operation. A solution of 120 g. (0.75 mole) of potassium ethyl xanthate in 150 ml. of water is heated to 40° and stirred while the solution of the diazonium salt is added dropwise. The temperature is not allowed to rise above 45°. The cooled mixture is extracted with ether, and the ethereal solution is washed with 10% aqueous sodium carbonate, then with water. After the solution has been dried over calcium chloride. 

Cleaning Up The aqueous layer from the first part of the reaction should be neutralized with sodium carbonate, diluted with water, and flushed down the drain. The aqueous layer containing hydrosulfite, saturated sodium chloride, and sodium hydroxide are treated with household bleach (5.25% sodium hypochlorite solution) until no further reaction is evident. After neutralizing the solution with dilute hydrochloric acid, the solution is diluted with water and flushed down the drain. Shake the mixture of silver oxide, silver, and sodium sulfate with water to dissolve the sodium sulfate, and then recover the mixture of silver and silver oxide by vacuum filtration. 

Cleaning Up Neutralize the reaction mixture with sodium carbonate, dilute with water, and flush down the drain. 

Components melting at low temperatures, so-called fluxes, react with the high melting point components, liquid phases being formed and solid state reactions occurring e.g. sodium carbonate reacts with the surface of sand from 550°C ... 

Accordingly, sodium hydroxide (17% aqueous solution) was stirred with the chlorohydrin ester masterbatch prepared above. The reaction was followed at 40 C using a molar ratio of sodium hydroxide to chlorohydrin ester of 2 1. The reaction was followed by gas chromatography. Fig. 18 shows the rates of conversion of epichlorohydrin and chlorohydrin ester during the reaction. Again, it was shown that after 6.5 hours all the sodium hydroxide had been consumed (cf. sodium hydroxide/sodium carbonate reaction at 40 C) at which time only 64% conversion to the epoxy compound was observed. Correspondingly the epichlorohydrin hydrolysis (25%) had increased in comparison to the sodium hydroxide/sodium carbonate method (15.6% at 40 C). 

A 15.0-g sample of sodium carbonate reacts with excess sulfuric acid to form sodium sulfate by the reaction below. When the reaction is complete, 16.9 g of sodium sulfate are recovered. What is the percent yield ... 

Dr. Hemistry s procedure is a straightforward one in which a given mass of solid sodium carbonate reacts with an excess of hydrochloric acid so as to quantitatively convert the sodium carbonate to sodium chloride. The reaction, indicated by Claire, is... 

Violent reaction with reducing agents, amines, ammonia, ammonium salts, combustible materials, oxidizable materials, sodium carbonate. Incompatible with sulfuric acid, caustics, alkanolamines, amides, organic anhydrides, isocyanates, vinyl acetate, alkylene oxides, epichlorohydrin. May increase the explosive sensitivity of nitromethane. 

Sodium acetate is prepared by reacting either sodium hydroxide (NaOH) or sodium carbonate (Na2C03) with acetic acid (HC2H302). With sodium hydroxide, for example, the reaction is ... 

HAZARD RISK Dangerous fire hazard when exposed to heat or flame contact with strong oxidizers may cause fire vapors may flow to distant ignition sources and flash back forms explosive mixtures with powdered sodium or phosphorus trichloride and sodium violent reaction with silver perchlorate and dimethyl sulfoxide closed containers exposed to heat may explode decomposition emits toxic gases of hydrogen chloride, phosgene, carbon monoxide, carbon dioxide NFPA Code H 2 F 3 R 0. 

Dimethylphenylphosphine, (CH3)2CgHg.P. —One molecular proportion of zinc dimethyl in a large volume of benzene is treated with one molecular proportion of phosphenyl chloride in the same solvent, the mixture being cooled in ice and the air in the apparatus being replaced by carbon dioxide. The reaction takes place smoothly and two layers separate, the lower one containing the double compound of the base with zinc chloride. This layer is separated, the benzene removed, and the residue treated with sodium carbonate, then with solid potassium hydroxide several times. 

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