Cobaltate potassium, dihydrate

C. RESOLUTION OF POTASSIUM (ETHYLENEDUMINETETRA-ACETATO)COBALTATE(III) DIHYDRATE, K[Co(edta)] HjO... 

CgHi2C0KNO9, Potassium aquo(nitrilotriacetato)cobaltate(II) dihydrate, 41B, 1029... 

Cn2H2sCoKNgNiOi4, Potassium tris(1,10-phenanthroline)nickel(II) tris(oxalato)cobaltate(III) dihydrate, 37B, 610 C4 2H3 8Cli,NftORe2 0.63 CHCI3, Tetrahydrofuranbis(N,N -diphenyl-benzamidinato)bis(dichlororhenium(111)) chloroform solvate, 41B, 1094... 

In another spectrophotometric procedure Motomizu [224] adds to the sample (2 litres) 40% (w/v) sodium citrate dihydrate solution (10 ml) and a 0.2% solution of 2-ethylamino-5-nitrosophenol in 0.01 M hydrochloric acid (20 ml). After 30 min, add 10% aqueous EDTA (10 ml) and 1,2-dichloroethane (20 ml), mechanically shake the mixture for 10 minutes, separate the organic phase and wash it successively with hydrochloric acid (1 2) (3 x 5 ml), potassium hydroxide (5 ml), and hydrochloric acid (1 2) (5 ml). Filter, and measure the extinction at 462 nm in a 50 mm cell. Determine the reagent blank by adding EDTA solution before the citrate solution. The sample is either set aside for about 1 day before analysis (the organic extract should then be centrifuged), or preferably it is passed through a 0.45 xm membrane-filter. The optimum pH range for samples is 5.5 - 7.5. From 0.07 to 0.12 p,g/l of cobalt was determined there is no interference from species commonly present in seawater. 

Cobalt Pyroarsenate, CoaAs207, is formed when cobalt oxide is fused with potassium metarsenate violet crystals are obtained on cooling.5 A dihydrate, Co2As207.2H20, has also been described.6... 

Potassium phosphate monobasic Magnesium sulfate heptahydrate Calcium chloride dihydrate Zinc sulfate heptahydrate Ferric sulfate heptahydrate Copper sulfate pentahydrate Cobalt(II) chloride hexahydrate Perchloric acid Potassium hydrocarbonate... 

Cobalt Chromate, CoCr04, is prepared by heating cobalt carbonate and chromic acid solution for several hours at 185° C. in a sealed tube.5 It yields greyish black crystals, readily soluble in hot dilute nitric acid (contrast nickel chromate). The dihydrate, CoCr04.2H20, is obtained by the interaction of cobaltic acetate and potassium chromate. It yields bronze-coloured prisms or leaflets.5... 

It has been established by X-ray analysis that in potassium (-b)58 -tris-(l,10-phenanthroline)nickel(ii) (—)5g,-trisoxalatocobaltate(m) dihydrate both complex ions have the A configuration. The mean Co-O distance is 1.93 A. The complex anion in sodium (- -)s4,-bismaIonatoethylenediamine-cobaltate(iii) has the A configuration the six-membered malonato chelate rings adopt boat conformations. ... 

CliHi1CUNO2, Acetylacetone-mono-(o-hydroxyanil)copper(II), 30B, 361 CliHi4C0KN2O9, Potassium (2-hydroxy-1,3-propanediamine-N,N,N, N -tetraacetato)cobaltate(III), 44B, 990 Cl iHi gN NiOi, (4-Methyliminopentane-2,3-dione 3-oximato) (4-iminopen--tane-2,3 dione 3-oximato)nickel(II), 39B, 789 CliHi0COKN2O1of Potassium (-)-trimethylenediaminetetraacetatocobalt--ate(III) dihydrate, 38B, 978... 

---