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... the concentration of the solution increases, all the three substituted benzoic acids such as p-CBA, p-NBA and m-NBA show an increase in ultrasonic velocity. It is seen from Figures-2, 3 and 4 that p-NBA showed the greatest increase in velocity. At 50% fraction of ethanol-water media, m-NBA displayed higher velocity values than p-CBA and p-NBA (Fig.-3). ...