Suppose I wanted to use a different font for a title then the body text in LaTeX (pdflatex). (For example, if I wanted to use a slightly fancier font for titles, or a sans-serif one.) How would I do that, change the font of a class of thing throughout the document, in a proper way. (Likewise, if I wanted to change the document title, captions, etc. Is there a general way of doing this?)


Question: Purification of Ethanol
Answer: The refluxing of methanol or ethanol over magnesium is indeed the method of choice to dry these solvents. 

As far as the iodine is concerned, this is a classical trick, which is also used to initiate Grignard rections. Is is assumed that magnesium iodide is formed, which is soluble in the alkanols. As a result, a fresh, activated metal surface is left behind. 

This might even work, when the magnesium metal is covered with a very thin oxide layer.