If you are talking about the solubility of these compounds in water than at room temperature Na2Cr2O7 is much more soluble in water than K2Cr2O7. As the temperature increases K2Cr2O7 becomes highly soluble in water. As far solubility in alcohol is K2Cr2O7 is insoluble whereas they are Na2Cr2O7 is soluble in methanol and ethanol.
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