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Each of the common metallic impurities-Al, Fe, K, Ca, and Mg-increased the density and viscosity at 25°C. of simulated wet-process phosphoric acids containing 50, 75, and 104.4% H3PO4. Common anionic impurities-Cl, F, S04, and S1O2had little effect on either viscosity or density. When two or more impurities were present, their effects were roughly additive, but no general relationship of the effects of the different impurities could be established.

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