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Physical Properties

Caustic soda is also known as sodiumhydroxide, caustic, and lye. Anhydrous(100%, solid) sodium hydroxide has a

chemical formula of a!" and a molecularwei#ht of $0.00.asic Properties of Caustic

&oda &olution '0%,apor pressure1.'mm"# * +- (0./0 kPa * /0-C)reein#pointApproximately '- (1$-C),oilin#

pointApproximately /23- (1$'-C),&pecific#ra4ity1.'/ #5ml * +- (/0-C)6Ph71$

Properties ofCaustic SodaSolution 50%Boiling Point

Approximately289 !"#$C&elting PointCrystalli'ation(egins 5#)#9

!"2)"5CSolidi*cation

Point #"!5C Solu(ilitySolu(le in

+ater, alco-ol,and glycerol

Speci*c .ra/ity!ater 1 "0"5$ at 30!"53C p4

"#0 at 20C

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Properties of 6i7uidCaustic Soda 50%$% Boiling Point288 !"#2C $2 !"89C&elting Point

!crystalli'ation(egins 50)55 !"0)"$ C "#0)

"## !30)32CSolidi*cation Point

#" !5C "#0!30C Speci*c.ra/ity "5$

:"53C "":90C p4 at 20C

"25 "25