Throughout 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, as well as proceeded with the experiment.
Would that student's computed molecular weight be too high, too low or would this type of contamination lead to no error in the final result? the sand wouldn't dissolve in water, and hence would just lie on top of the resin column as well as lead to no ion exchange results.