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Posts Tagged ‘chemistry’

DIY PCB Etching: Not Electrolyzing Salt to Make Cupric Chloride

The tutorials use hydrochloric acid and hydrogen peroxide as the starting etchant not because they aren’t adventurous but because that is what works best (as opposed to using electrolysis). The starting etchant (hydrochloric acid and hydrogen peroxide) Once again, the starting etchant provides chlorine that will oxidize copper to form cupric chloride: Hydrochloric acid is […]

DIY PCB Etching: Colors of Compounds and Helpful Links

UPDATE 11/10/11: Although most of these colors are accurate when dealing with concentrated solutions of salt, some are not (e.g., descriptions of copper (I) and (II) chlorides are mixed up). Take it with a pinch of… salt. Yellow? Copper hydroxide is supposed to be green! If you have already been at this for hours and […]

DIY PCB Etching: Electrolyzing Salt to Produce Cuprous Chloride

tl;dr: You cannot produce an effective cupric chloride etchant using only salt, copper, and electricity. Yet I spent a week trying to do just that. Essentially, I wanted an effective etchant-producing method that didn’t require buying anything out of the ordinary. I mean, all the right elements were there (i.e., chlorine and copper). Unfortunately, other […]

DIY PCB Etching: Overview and Production of Ferric Chloride

I liked the look of the LED-outlined propeller, so I decided I would etch my own PCBs to make it easier to light up all three propellers. I’ve spent the last week researching DIY PCB etching methods and doing some unsafe home electrochemistry that has left me with minor chemical burns in various spots all […]

Chemistry and LaTeX with mhchem

There is a LaTeX package called mhchem available that makes typesetting chemical equations a lot easier. Sure, you could be lazy and type it all out in math mode like this (sorry, I don’t know much chemistry yet): or in text mode: C$_6$H$_{12}$O$_6$ + 6O$_2 xrightarrow{text{heat}}$ 6CO$_2$ + 6H$_2$O But that’s ridiculous. Writing it is […]