Application of Beer's law to the solutions of potassium dichromate, picric acid, didymium nitrate, methyl violet, methylene blue. chromic acid, nickel nitrate, nickel sulphate, nickel chloride and cobalt chloride has been tested. It is observed that nickel chloride and cobalt chloride behave similarly to cupric chloride and does not obey Beer's law While solutions of other substances follow the law more or less approximately, deviation being greater as the concentrations become widely

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... The results also indicate that ionisation alone is not responsible for deviation from Beer's law