Investigation for Phosphates from the Viewpoint of Analytical Chemistry.II

In connection with first report, details of precipitation of zinc pyrophosphate have been investi gated. Some discussions have also been centered on the preparation of metaphosphate and a pure trimetaphosphate has been prepared for analytical work. A new volmetric determination of pyrophosphate has been performed within the error in usual volumetric analysis in the presence of ortho-and trimetaphosphates. The results were very satisfactory in comparison with the other methods.