What happens when an alkali is added to a dichromate solutions
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When alkali is added to the dichromate solution, for example sodium hydroxide is added to dochromate solution then the orange color turns back to yellow, hydroxide ions react with hydrogen ions forming water, driving the equilibrium to the right (OH- removes H+ ions by neutralizing them and the system acts to counteract the change) and further shifting the color. We can observe that the addition of hydroxide ions promotes the conversion of dichromate to chromate.
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When an alkali or base is added to a dichromate solution, there is a shift in the position of the chemical equilibrium. ... This shifts the equilibrium to the right i.e. the OH- ions removes H+ ions by neutralizing them and shifts the color. Thus, adding of hydroxide ions or alkali converts dichromate to chromate.
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