Hydrochloric acid equivalent weight

Apparent equivalent weight deterrnined by titration with hydrochloric acid. APHA color determined by ASTM D1209, platinum—cobalt method. 

Apparent equivalent weight can be deterrnined by titration with hydrochloric acid using a bromocresol green indicator. Calculations give the equivalent weight of total amines and are not specific for the mono-, di- or tri alkan olamines. 

If acetal has been isolated, it may best be hydrolyzed by boiling with an equivalent weight of ethyl alcohol and concentrated hydrochloric acid (2 cc. for each 50 cc. of alcohol used) for four or five hours, then distillation of the ethyl alcohol, and treatment with water. 

No. The equivalent weight of sulfuric acid is different from that of hydrochloric acid, but it does not enter into the calculation. 

A weight of compound, containing about 0-05 g. of fluorine, was dissolved in 10 ml. of dry alcohol and metallic sodium (about 0 5 g., i.e. at least 5 equivalents) was added. After the sodium had dissolved, the mixture was gently heated under reflux for 5 min.,8 and then washed out with about 100 ml. of water into a beaker, made acid to bromophenol blue with dilute nitric acid and then just alkaline with 10 per cent sodium hydroxide solution. Three ml. of 10 per cent sodium chloride solution were added and the solution was diluted to 250 ml. One ml. of concentrated hydrochloric acid was added, and the solution heated on a water-bath to about 80°. Then 5-0 g. of finely powdered A.R. lead nitrate were added with stirring (still at 80°). As soon as all the lead nitrate had dissolved, 5-0 g. of crystalline sodium acetate were added, with vigorous stirring. The product was then heated on the water-bath for 15 min. and cooled in ice, and the precipitate was filtered off on a Swedish filter paper. It was washed once with water, four times with saturated PbClF solution... 

Procedure Weigh accurately 0.5 g phenobarbitone sodium and dissolve in 15 ml of DW. Add to it 5 ml of 2 M hydrochloric acid and extract with 50 ml of ether and then with successive 25 ml quantities of ether until complete extraction is affected. Wash the combined extracts with two 5 ml quantities of DW and wash the combined aqueous extracts with 10 ml quantities of ether. Add the ether to the main ethereal extract, evaporate to low bulk, add 2 ml of absolute ethanol, evaporate to dryness and dry the residue to constant weight at 105°C. Each g of residue is equivalent to C12HnN2Na03. 

Arfwedson prepared lithium acetate, ignited it, and noted the insolubility of the resulting lithium carbonate in water and its action on platinum. He also prepared and studied the bicarbonate, sulfate, nitrate, chloride, tartrate, borate, hydroxide, and a double sulfate which he reported as lithium alum. He mentioned that lithium hydroxide is much less soluble than the other caustic alkalies and that it has a greater saturation capacity [lower equivalent weight] than they. Because of its ability to form deliquescent salts with nitric and hydrochloric acids, Arfwedson recognized the close relation between the new alkali and the alkaline earths, especially magnesia. 

As an example, the chlorine atom of potassium chloride (KCl) also is found in hydrochloric acid (HC1) in combination with one hydrogen atom, Thus, the gram-equivalent weight of KCl is 74.555, which is the same as its gram-molecular weight. A one normal solution of KCl will contain 74.555 grams of the salt per liter of solution. 

Treat 1 g (1 ml) of the amine with 4 molar equivalents of 10 per cent sodium or potassium hydroxide solution (say, 20 ml), and add 1.5 moles (or 3 g if the molecular weight is unknown) of benzenesulphonyl or toluene-p-sulphonyl chloride in small portions with constant shaking. To remove the excess of acid chloride, either shake vigorously or warm gently. Acidify with dilute hydrochloric acid and filter off the sulphonamide. Recrystallise it from ethanol or dilute ethanol. 

---