This question is a postlab. (This is the only question that came before. It is a prelab. It doesn't have to be answered.

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This question is a postlab.

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(This is the only question that came before. It is a prelab. It
doesn't have to be answered.)

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After the gravity Filtration performed in Day 2. you are directed to rinse the alum crystals with cold water. What is the primary chemical being rinsed from the surface of the alum crystals? Choose one answer from below. sulfuric acid potassium hydroxide aluminum plastic from the label

With regards to the step referred to in Part A, why does the deionized water need to be cold? Choose one answer from below. To avoid boiling the crystals. To avoid a side reaction with the water. To avoid contaminating the crystals with impurities in the water. To avoid dissolving the crystals.

Assume a student used 2.27 g of aluminum metal to synthesize alum. What would be this students theoretical yield? Choose one answer from below. 39.99 474.469 0.1296 26.98 9

If this same student recovered 7.89 g of alum, what is the percent yield? Choose one answer from below. 80.2% 19.8% 50.6%

Which of the following errors would cause your percent yield to be falsely high, or possibly even over 100%? Select ALL that apply. Taking the mass of your alum crystals while wet. Accidentally including the weight of the weighing paper with the original mass of aluminum metal. Using warm water to rinse the alum crystals after the gravity filtration Using more than 40 mL of KOH.

For the Day 1 procedure, what should you do if your ending solution has a volume under 75 mL? Choose one answer from below. Pour out some solution until the solution volume is correct. Add deionized water until the solution volume is correct. Add tap water until the solution volume is correct. Continue heating over the Bunsen burner until the solution volume is correct. When using sandpaper to remove some of the plastic label from your can, why is it important to place the metal on an asbestos-free pads Choose one answer from below. To avoid scratching the lab bench with the sandpaper. To avoid reaction with the lab bench, To avoid picking up contamination from the lab bench. In Day 1, your product will be in the after the gravity filtration process. Choose one answer from below. filtrate gaseous state filter paper In Day 2, your product will be in the after the gravity filtration process. Choose one answer from below. filter paper gaseous state filtrate