... point at 622Deg. C, easily soluble in water, with remarkable chelating ability to some metal ions ... such as Ca2+, Mg2+, can soften hard water, change suspension into solution, alkalescent, without causticity. ... main auxiliary of synthetic wash, soap synergistic agent, water softener, leather pre-tanning agent, dye auxiliary agent ... 0.01% max Ph of 1% water solution: 9.5-10.0 Chloride, as cl: 0.025% ...