Hyposulphite

(Chem.) A compound of hyposulphurous acid and a base. Hyposulphuric Acid, n. (Chem.) An acid formed by pa ing sulphurous acid through water in which finely divided peroxide of manganese is suspended. If the liquid is kept cool, hyposulphate of manganese is formed. By adding baryta-water, hyposulphate of ba- ryta is produced, which may be decomposed by sulphu- ric acid. Its salts are important. Form . S2Op. Hyposulphurous Acid, DITHIONOUS ACID, TRI- SULPHURIC ACID, n. ( Chem .) This acid is formed in com- bin at i on with soda by fusing equal parts of carbonate of soda and sulphur, di olving the impure sulphide of sodium formed, and pa ing through the solution a cur- rent of sulphurous acid until it ceases to be absorbed. The liquid is filtered and evaporated, and large crystals of hyposulphite of soda are formed. This salt has re- ceived important applications as a fixing agent in pho- tography, and as an anti chlorine in bleaching, to re- move the last traces of chlorine from bleached paper or fabrics. The acid has never been isolated; for if a stronger acid be added to any of the hyposulphites, it splits up into S+SO2. The hyposulphites are easily recognized by the property they po e of di olving chloride of silver, forming with it an intensely sweet solution. Besides the double hyposulphite of soda and gold, which is used in photography under the name of sel d'or, the salt of soda is the only one which has re- ceived any important application. Equiv . 48. Form . S2Og. Hypotenuse, n. See HYPOTHENUSE. Hypotheca, n. [Lat.; Gr. hypotheke ; Fr. hypothèque .] (Civil Law.) The right acquired by the creditor over the immovable property which has been a igned to him by his debtor as security for his debt, although he be not placed in po e ion of it; - answering to our mortgage. Hypothecate, v . a . ( Law .) To mortgage. -To state by hypothesis. Hypotheca'tion, n. (Civil Law.) An engagement by which the debtor a igns his goods in pledge to a creditor as a security for his debt, without parting with the immediate po e ion; differing, in this last particu- lar, from the simple pledge. (Law of Shipping .) The pawning of a ship for nece aries, or to raise money in some critical emergency. Hypothecator, n. One who pledges a ship or other property as security for the repayment of money bor rowed. Hypothenu's al, a. That belongs to the hypo the nuse.