Barium chloride solution preparation

An approximate determination may be made by means of the barium chloride solution prepared for determining the extent of plastering. To this end, separate quantities of 50 c.c. of the wine are treated with different volumes of the barium solution until a filtrate is obtained which remains almost clear with a drop of either the barium solution or dilute sulphuric acid the amount of the reagent used gives approximately the quantity of sulphates present. 

What is the molarity of a barium chloride solution prepared by dissolving 1.50 g of BaCl2 2H2O in enough water to make 600 mL of solution ... 

Preparation of a Sulphur Sol. Prepare a saturated solution of sulphur in ethanol in a test tube. Take 2-3 g of sulphur and 10 ml of ethanol for this purpose. The solution will become saturated after vigorous shaking during 15 min. Filter off the undissolved sulphur, measure off 5 ml of the solution, and carefully pour it dropwise into 20 ml of distilled water. Pour part of the colloidal solution into two test tubes in equal portions. Add 1 ml of water to the first tube and 1 ml of a barium chloride solution to the second one, and heat both tubes. What happens How does the electrolyte affect the stability of the solution Define a gel and a sol. 

Sulphates. — On adding barium chloride solution to 20 cc. of the 1 20 aqueous solution prepared by the aid of heat, no change should appear. 

Barium Niobate.—A salt having the composition 7Ba0.6Nb20s. 18H20 is prepared by treating a hot solution of the corresponding sodium salt with dilute barium chloride solution.3... 

An alcoholic soap solution (white Marseilles soap in about 60% alcohol, see Water, Vol. I) is prepared of such concentration that 1 c.c. corresponds with 0-0005 gram of CaO. The titre is controlled by means of barium chloride solution containing 0-436 gram of crystallised barium chloride per litre 40 c.c. of this solution should require 8 c.c. of the soap solution to form a persistent froth after agitation. 

Place a drop of barium chloride solution upon filter or drop-reaction paper, followed by a drop of a freshly prepared 0-5 per cent aqueous solution of sodium rhodizonate. Treat the reddish-brown spot with a drop of the acid or alkaline test solution. The coloured spot disappears. 

Kobayashi, N. and Ando, H. (1988fc). Monoazo lake for printing inks etc.—prepared by diazotizing 2-amino-5-methyl benzenesulphonic acid, coupling with 2-hydroxy-3-naphtholic acid and adding barium chloride solution. Dainippon Inc. Patent JP63-225 667 Chem. Abstr, 110, 77504. [26It]... 

Add boilingZhot 20 mL of 6% barium chloride solution preferably with the help of pipette, drop by drop with stirring. Barium chloride solution should be prepared at least one day before use. Freshly prepared barium chloride solution should be filtered through fine filter paper. 

The test for ID of the counterion associated with terbutaline sulfate is similar to that for imiprimine HCl. A water solution of terbutaline sulfate is prepared and acidified with hydrochloric acid. Upon addition of a few drops of barium chloride solution, a white precipitate forms, which indicates barium sulfate. 

Selivanova, Maier, and Luk yanova [63SEL/MAI] prepared CdSe04 H20(cr) and CdSe04(cr) and measured their heats of dissolution in water (1 1200) in a calorimeter. They also measured the enthalpy change of the reaction between the monohydrate and a barium chloride solution with formation of BaSe04(cr). The result of the last reaction has been re-evaluated in Table A-36. 

Materials Sulphur dioxide prepared in Experiment 60, splinter, copper wire, dyed silk, carnation, potassium chlorate, chlorine water, litmus paper, barium chloride solution, hydrogen sulphide, samples for analysis. 

Racemic ammine-hexol iodide is obtained by converting the sulfate, which is prepared according to the procedure of Kauffman and Pinnell, to the chloride with barium chloride solution and then by metathesis with sodium iodide solution. The racemic ammine-hexol iodide is stirred with sodium bis(/i-d-tartrato)diantimonate(III) in a weakly acidic solution. The precipitated (-I- )-diastereomer is converted to the (-I- )-bromide with sodium bromide. The ( — )-enantiomer is isolated as the sparingly soluble sulfate by adding ammonium sulfate to the filtrate from the (-I- )-diastereomer precipitation, and then converted into the chloride by adding barium chloride, and the ( — )-enantiomer is finally isolated as the bromide by metathesis with sodium bromide. 

Some ionic adsorbents show unusu ll properties (see, for example, [15, 58, 68-70]). Belyakova and co-workers [68-70] have proposed barium sulfate as a selective adsorbent They successfully used barium sulfate modified with sodium chloride for separation of some isomers of unsaturated, aromatic hydrocarbons, and oxygen- and nitrogen-containing heterocyclic compounds [68]. Barium sulfate was prepared by interaction of s< ium sulfate and barium chloride solutions of various concentration present in equimolar proportions. The specific surface areas varied from 2.5 to 8 m /g. To investigate this ionic adsorbent, glass Ccipillary columns (1 mm i.d.) were packed with barium sulfate particles (0.16-0.20 mm). The maximum value of separation selectivity for all xylene isomers was observed on barium sulfate samples modified with 15% sodium chloride solution [69]. According to electron spectroscopy for chemical analysis these samples contained on the surface about 2% of... 

Prepare a solution which is 0.1 M in NaOH and 0.05 M in sodium carbonate. Titrate 25.0 cm aliquot against standardised 0.2 M HCl using bromophenol blue indicator. Repeat and calculate the average volume. Use another aliquot of the mixed solution, warm to 70°C, add 1% barium chloride solution gradually until all the carbonate has been precipitated. Cool, add a few drops phenolphthalein indicator and titrate with the acid until a drop removes the pink colour. The titre gives the hydroxide neutralised. Repeat and work out the average titre. From die difference between the titres in the two cases, calculate the [carbonate] in mol dm. Calculate from the second titre [hydroxide] in mol dm . ... 

Prepare 0.5 M iron(lll) nitrate solution acidified to prevent hydrolysis. Prepare 2 M solution of NaOCl in water. Dissolve 2 g NaOH in 50 cm of the solution. Heat to boiling and add, dropwise, the iron solution until there is no change in colour. Boil the mixture for 2 minutes. Filter the suspension through a glass wool plug and collect the filtrate in a conical flask. Add slowly to the filtrate barium chloride solution while stirring. Filter the precipitate under suction, wash with a little water and dry by pressing between filter paper under suction. 

A sample containing 5-50 mg ethoxylate in about 90 mL water is mixed with 10 mL of 0.1 M barium chloride solution and titrated with 0.01 M aqueous sodium tetraphenylborate solution (prepared with 10 g polyvinyl alcohol and 10 mL 0.1 M NaOH per liter of titrant). The titration is made potentiometrically, using the Metrohm surfactant indicating electrode and a silver/silver chloride reference electrode (NaCl filling solution). The electrode must be rinsed free of precipitate after every few titrations using methanol. An electrode... 

Prepare a solution of 41 g. of anhydrous palladium chloride (1) in 10 ml. of concentrated hydrochloric acid and 25 ml. of water (as in A). Add all at once 60 ml. of 6iV-sulphuric acid to a rapidly stirred, hot (80°) solution of 63 1 g. of A.R. crystallised barium hydroxide in 600 ml. of water contained in a 2-htre beaker. Add more 6iV-sulphuric acid to render the suspension just acid to htmus (5). Introduce the palladium chloride solution and 4 ml. of 37 per cent, formaldehyde solution into the hot mechanically stirred suspension of barium sulphate. Render the suspension slightly alkaline with 30 per cent, sodium hydroxide solution, continue the stirring for 5 minutes longer, and allow the catalyst to settle. Decant the clear supernatant hquid, replace it by water and resuspend the catalyst. Wash the catalyst by decantation 8-10 times and then collect it on a medium - porosity sintered glass funnel, wash it with five 25 ml. portions of water and suck as dry as possible. Dry the funnel and contents at 80°, powder the catalyst (48 g.), and store it in a tightly stoppered bottle. 

Zinc sulfide can also be prepared by the direct reaction of barium sulfide and 2inc chloride solution ... 

Barium nitrate is prepared by reaction of BaCO and nitric acid, filtration and evaporative crystallization, or by dissolving sodium nitrate in a saturated solution of barium chloride, with subsequent precipitation of barium nitrate. The precipitate is centrifuged, washed, and dried. Barium nitrate is used in pyrotechnic green flares, tracer buUets, primers, and in detonators. These make use of its property of easy decomposition as well as its characteristic green flame. A small amount is used as a source of barium oxide in enamels. 

Barium nitrite [13465-94-6] Ba(N02)2, crystallines from aqueous solution as barium nitrite monohydrate [7787-38-4], Ba(N02)2 H2O, which has yellowish hexagonal crystals, sp gr 3.173, solubihty 54.8 g Ba(NO2)2/100 g H2O at 0°C, 319 g at 100°C. The monohydrate loses its water of crystallization at 116°C. Anhydrous barium nitrite, sp gr 3.234, melts at 267°C and decomposes at 270 °C into BaO, NO, and N2. Barium nitrite may be prepared by crystallization from a solution of equivalent quantities of barium chloride and sodium nitrite, by thermal decomposition of barium nitrate in an atmosphere of NO, or by treating barium hydroxide or barium carbonate with the gaseous oxidiation products of ammonia. It has been used in diazotization reactions. 

Pilocarpine dissolves in dilute soda solution, and the rotation is thereby reduced, due to the formation of the sodium salt of pilocarpic acid, CiiHigOgNa, of which pilocarpine is the lactone. Amorphous barium and copper salts have been prepared. Pilocarpine in dilute sulphuric acid gives with hydrogen peroxide, followed by potassium dichromate, a bluish-violet colour soluble in benzene. For the identification of the alkaloid Wagenaar recommends precipitation with gold chloride solution. 

Two grams of the oU are saponified the portion insoluble in water separated by shaking with ether, and the aqueous solution neutralised with acetic acid. The solution is dUuted to 50 c.c. and 10 c.c. of cold saturated solution of barium chloride added. It is then warmed for two hours on a water-bath and allowed to cool. If a crystalline deposit is formed, the oil is to be considered adulterated, as the acids contained in normal lavender oil, acetic and butyric acids, give soluble barium salts. It is evident that this test will only detect those acids whose barium salts are insoluble. A more comprehensive test is therefore needed, as several other esters have since been employed for adulteration purposes. Glycerin acetate, prepared by the acetylation of glycerine, was first de-... 

Note. A suitable solution for practice may be prepared by dissolving about 0.3 g of accurately weighed barium chloride in 100 mL water and adding 1 mL of concentrated hydrochloric acid. 

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