EXP #6 POST-LAB: Missy Mae is in a hurry to get home to play some more Resident

Question

EXP #6 POST-LAB: Missy Mae is in a hurry to get home to play some more Resident Evil 7. In her haste; she deviates from the experimental procedure in several ways. Explain how these would affect the outcome of the end result, number of milligrams of iron in the tablets. Would these sway the result erroneously higher, lower, or make no change? Explain During the standardization of the KMnO4 portion, she weighs all the FAS but spills a portion of it on the lab counter, never adding the full amount to the titration flask. a) b) There is a bubble in the buret containing the KMn04 solution, which comes out unnoticed during part 2 of the experiment; the titration of the FAS. 2. Why did you add sulfuric acid to each sample titrated? 3. On a bottle of iron supplement the facts list on the label states the following: Ingredients: Dried ferrous sulfate 202 mg (equivalent to 325 mg Liquid Ferrous Sulfate which provides 65 mg elemental iron per tablet)" Use your knowledge of % composition of compounds to make a scientific statement (with complete sentences) proving or disproving what the label states.

Explanation / Answer

a) If FAS spills, it will make an error in the mass of Fe and that will be less than the actual value.

Answer is lower

b). if a bubble is occupying on the KMnO4 burette, we will not get the actual volume of KMnO4. The obtained volume will be the volume of KMnO4 consumed + volume of the air bubble. This will imply, a more amount of Fe2+ in the solution. Thus the reported value will be higher than the actual value.

the answer is higher.

3. Dried ferrous sulfate has a mass 202 mg and which is equal to 325 liquid FeSO4

this means one-mole liquid ferrous sulfate has 325-202 = 123 g water (number of moles = 123/18 (18 is the molar mass of water))

or one FeSO4 has 6.8 approximately 7 water of crystallization

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