1) Determine how the following error would affect calculated the percent yield o

Question

1) Determine how the following error would affect calculated the percent yield of alum. (increase, decrease, no effect). Briefly explain. 1a. The Aluminum foil did not completely react. 1b. Alum sample was left in the beaker and not transferred to the filter paper. 1c. Alum Sample was not dried completely in the oven. 2) A piece of an aluminum can was cut into small pieces. Then 0.422g of the pieces from the can was used to prepare potassium alum according to the procedure used in lab. How many grams should you expect if you had a 83.8% yield? (alum MW = 474.41g/mol)

Explanation / Answer

1a. The percent yield depends on starting material. If the amount of starting material is high, then the percent yield is also high.

If aluminum foil did not completely react, then the percent yield decreases.

1b. there is loss of product during the transfer. So, the percent yield decreases.

1c. If product not dried completely, some amount of moisture present within the sample. So, the weight of the product is high than the actually present.

So, the percent yield increases.

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