NAA 98% Naphthaleneacetic acid dissolved in 50ml absolute ethanol

NAA 98% Naphthylacetic Acid Naphthaleneacetic acid dissolved in 50ml absolute ethanol。Dissolves quickly, and the solution is clear and transparent without impurities.
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[@kissanghar]

如何在一公升中配製 98% 的 4.5% 溶液？乙醇中應添加多少萘乙酸才能製成每公升 4.5%？

[@kissanghar]

How can we prepare 98% of 4.5% solution in one liter? What amount of naphthyl acetic acid should be added to ethanol to make 4.5% per liter?