In this experiment you will obtain a sample of Magnesium and form Magnesium Chlo
ID: 875952 • Letter: I
Question
In this experiment you will obtain a sample of Magnesium and form Magnesium Chloride using Hydrochloric Acid. Next you will heat the solution in an evaporating dish in the presence of oxygen O2 to form Magnesium Chloride Hexahydrate and subsequently Magnesium Oxide.
A student rushed in order to complete this experiment quickly. In attempting to save time, the student made some procedural errors. Briefly describe the effect of each of the following errors on the calculated ratio of Mg to O (indicate whether the calculated ratio would be unaffected, too high, or too low). Thoroughly explain your reasoning.
a.) The student did not heat the crucible and crucible cover to constant mass before adding Mg and carrying out the reaction.
b.) The student failed to clean the tarnished Mg ribbon with steel wool, before using the Mg.
c.) Rather than adding 6 M HCl solution dropwise as directed, the student poured 3 mL of 6 M HCl solution onto the Mg in the crucible. The solution foamed, and some material splattered out of the crucible.
d.) When transferring the crucible from the hood to the balance, the student sneezed, blowing some of the fluffly product out of the crucible and onto the floor. Because it was impossible to collect the lost solid, the student continued the experiment using the remaining product.
e.) The student decided not to heat the crucible and contents to constant mass, following the reaction of Mg with HCl solution and atmospheric O2.
A sample of the oxide of magnesium weighing 10.000 g contains 6.031 g of Mg. Use these data to determine the empirical formula for the oxide of magnesium?
Explanation / Answer
a.) The student did not heat the crucible and crucible cover to constant mass before adding Mg and carrying out the reaction.
Answer:- If student didn
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