Salt Lake Herald-Republican | 1918-09-08 | Page 28 | Sodium Salt, or ''Hypo," Production

Sodium r Salt or oril il Production Hypo 1 o SO Sodium generally called h po itc or hypo b by photographers Is used use Jn In n dyeing and to some ome extent l. In removing the Uio last la t traces of or n chlorine rine from Crom cotton and paper papel that have hac been bleached b by chlorine as we well as in analytical nal tl al 1 cheni chemistry tr and in photography pho- pho i aph Its fIls use as asa it fixing agent In photography photography- photo raph d depends on Its solvent action action ac ac- ac- ac I tion on silver er salts tint that have ha not been heen affected by li light ht It I is made in several wn ways s 's usually by boiling n n. solution of oC sodium sulphite with sulphur and concentrating concentrating con con- the solution to the thc point of crystallization In Iii 1917 n i the United States Stales produced 95 short tons of oC i this salt valued at according to statistics complied compiled by R. R C. C Wells Well of ot I the United States geological survey depart department ment of oC the interior I In 1917 the United States pro produced I I l 1709 O tons of sodium odium sulphite and so sodium sodium so- so I fo-I bisulphate valued at t These salts which are used in photography photography pho- pho I as ag well as In bleaching delicate delicate deli deli- cate cato fabrics and in removing traces of or I chlorine from fabrics to which a n. chlorine bleach has been heen applied are 1 II made from Crom sodium carbonate and sulphur sulphur sulphur sul sul- dioxide The fhe Is themore tho the more active e breaching agent The two salts have havo formulas which are analogous analogous anal anal- to th these se o of sodium carbonate and sodium bicarbonate but sodium sulphite crystallizes with seven sc molecules molecules mole mole- moJe 1 cules of or water whereas sodium carbonate ear car ar- ar bonate onate crystallizes with ten 1