At what concentration of trivalent iron in water is red color visible to the naked eye?
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What is the concentration of trivalent iron in water required for red color to be visible to the naked eye?
Iron ions appear yellow in water; only when iron ions combine with thiocyanate ions do red compounds form. To the naked eye, it appears red, which is related to the presence of other interfering ions in the water; there is no single value that can summarize this.