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Given the following reaction: 2CrO42(aq)+2H+(aq)Cr2O72(aq)+H2O(l) Add 6MNaOH, mixing until a colour change occurs. Why did the colour change even though NaOH isn't listed as a

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Given the following reaction: 2CrO42(aq)+2H+(aq)Cr2O72(aq)+H2O(l) Add 6MNaOH, mixing until a colour change occurs. Why did the colour change even though NaOH isn't listed as a reactant? You will need to include an equation

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