Disodium

Trade Name Manufacturer Country Year Introduced 

Dechamps, G., Le Bihan, H. and Baudet, C. U.S. Patent 2,506,794 May 2,1950 assigned to Societe Beige de I azote et des Produits Chimiques du Marly (Belgium) 

Chemical Name N-(2-carboxy-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0] hept-6-yl)-2-phenylmalonamic acid sodium salt 

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As(ONa), -I- CH,I — [CH,As(ONa)jI] CH,AsO(ONa), — CH,AsO(OH), unstable product losing sodium iodide to form disodium methylarsonate, which on acidification liberates methylarsonic acid. Note that this synthesis is limited to alkylarsonic acids, whereas the Bart synthesis (p. 312) is limited to aiy larsonic acids. 

Direct titrations are commonly carried out using disodium dihydrogen ethylenediaminetetraace-tate, NajHjY, which is available in pure form. The reaction of the chelon with the indicator must be rapid for a practical, direct titration. Where it is slow, heating of the titration medium is often expedient, or another indicator is employed. 

Standard EDTA Solutions. Disodium dihydrogen ethylenediaminetetraacetate dihydrate is available commercially of analytical reagent purity. After drying at 80°C for at least 24 hr, its composition agrees exactly with the dihydrate formula (molecular weight 372.25). It may be weighed directly. If an additional check on the concentration is required, it may be standardized by titration with nearly neutralized zinc chloride or zinc sulfate solution. 

Disodium salt of 6-hydroxy-5-[(2-methoxy-5-methyl-4-sulfophenyl)a2o]-2-naphthalenesulfonic acid... 

COLORANTS FORFOOD,DRUGS,COSTffiTICS AND TffiDICALDEVICES] (Vol 6) Disodium salt of tetrabromophthalate... 

PORONCOMPOUNDS - BORON OXIDES, BORIC ACID AND BORATES] (Vol 4) Disodium tetraborate pentahydrate [12045-88-4]... 

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