A series of heteropoly tungstocobaltates (3), containing both bivalent and tervalent cobalt, was analyzed by these methods. In some cases the proportion of tungstate was several times that cited above, but the end point was always sharp. The substances are not good primary standards, but the results showed excellent consistency.Examples: percentages calculated for Cs6H- [Co+2Co+3Wi2042].13H20: cesium, 19.8; tungsten, 54.8; water, 6.04; cobalt (tervalent), 1.47. Found: cesium, 19.9; tungsten, 54.9; water, 6.00; cobalt (tervalent), 1.47. (Total cobalt is always a little high in compounds of this anion because the method of preparation leaves them impure in that respect.
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