what happens when an alkali is added to a dichromate solution and the chemical equation involved
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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.
When an alkali like sodium hydroxide is added to the dichromate solution, the orange color of the solution turns to yellow color. This is because the hydroxide ions react with the hydrogen ions and form water. 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.
Cr2O7 ^2- +H2O → 2CrO4- + 2H+
When an alkali like sodium hydroxide is added to the dichromate solution, the orange color of the solution turns to yellow color. This is because the hydroxide ions react with the hydrogen ions and form water. 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.
Cr2O7 ^2- +H2O → 2CrO4- + 2H+
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