A student conducting a spectrophotometric determination of copper in a brass lab experiment decided to omit the filtering step because the brass solution did not appear very cloudy. It turned out that there was tin in the sample.

a) Did the omission of the filtering step cause a high or low result? Briefly explain.

b) During the filtering process, some of the brass solution is absorbed by the filter paper. Would this cause a high or low result for percent copper? Briefly explain.

A high result for the percent copper would result from the filtering phase being skipped, and a low result would result from the filter paper absorbing some of the brass solution.

a) The omission of the filtering step would likely cause a high result.

This is because the tin in the sample would not have been removed, and would contribute to the absorbance reading, leading to a higher result than if the tin had been removed through filtering.

b) The absorption of some of the brass solution by the filter paper would likely cause a low result for percent copper. This is because some of the copper in the solution would be absorbed by the filter paper and would not be included in the final absorbance reading, leading to a lower result than if all of the copper had been included.

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