During the weighing of their unknown for this experiment, a student inadvertentl

Question

During the weighing of their unknown for this experiment, a student inadvertently contaminated their sample with a few grains of sand (SiO2), recorded the weight of the of the contaminated sample, and proceeded with the experiment.

Would that student's calculated molecular weight be too high, too low, or would this type of contamination lead to no error in the final result? NOTE: the sand would not dissolve in water, and hence, would just lie on top of the resin column and lead to no ion exchange results.

Explanation / Answer

Resin Column Ion exchange experiment.

we record the weight of sample

then find the number of moles by ion exchange.

Mol. wt = weight of sample/moles.

as,

sand would not dissolve in water, and hence, would just lie on top of the resin column and lead to no ion exchange results

moles will remain constant in both contaminated and pure sample.

but due to contamination, weight measured will be too high,,..

so calculated molecular wt. would be too high.

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