Hummel, J. J. (John James), d. 1902 · London : Cassell · leaf 146
ere aslightly alkaline water is not prejudicial, caustic sodamay l3e conveniently substituted for quicklime, since itssolution can so readily be made of a standard sti*engthand added in the requisite amount to the water to l>ecorrected :— CaH^CCO,,), + 2 XaHO = CaCOs + NasCOg + 2 H.O. In this… … Fig. 40.—Plau of Porter-Clarks Apparatusfor Softening Water. Chap. IX.] PURIFICATION OF WATER. 133 settling of the precipitate. Mechanical impurities, alsoiron, aluminium, and earthy phosphates are completelythrown down. Permanent as well as temporary hardness is removedby the use of caustic soda,…
Dyes and dyeing
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
