physical chemistry, Chemistry

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in an electrophoresis experiment , spherical colloidal particles of diameter 0.5 um are disperside in a solution of 0.10mol per litter nacl , if the particles are observed to cover a distance of 120 um in 5.0 s , calculate an estimate of the error in the electrophoresis measuerment arising from the brownian displacement of the particle that occures during the experiment ??

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