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[Cr2O7]^2- + H2O ⇋ [CrO4]^2- + 2H^+ [Cr2O7]^2-] = [CrO4]^2- at pH ≈ 6.2 ([HCrO4]^- also present) the color change is orange to yellow and the eye can't distinguish this change with sufficient accuracy to meet the standard required for an analytical indicator.
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