More Car Talk "Chemistry"

Regular readers know my fascination for all things NPR, and Car Talk in particular. This week's broadcast had me rolling in the aisles for a different reason: some cover-your-eyes-awful chemistry.

A "white residue" in the engine?
Get the peanut butter!

Let's set the scene: Tom and Ray had taken a call from Ann, who begged that they were her "last hope" for an aging, ailing Subaru wagon. Ann's son apparently noted a funny white "mist" coming out of the car a few months ago. After several expensive repairs (heater core, radiator), a white, powdery substance was still forming in the engine block.

The guys considered that a single engine part had failed, perhaps something plastic or rubber, but discarded that theory since previous repairs had not fixed the problem. Then Tom suggested that the car might be continuously producing the white residue, perhaps through combustion gases which found their way into the radiator fluid through a leaky gasket.

Tom short-listed some potential combustion "bad actors" - carbon, carbon dioxide, carbon monoxide, nitrous oxide. Aha! The nitrous oxide must be forming nitric acid, thus corroding the engine block. "It's Chemistry 101!" he exclaimed.

Except...not. I know that nitrogen dioxide or NO_x emissions from cars generate nitric acid in the presence of water, but last I checked, whipped cream cans and dental offices everywhere remained safe from acidic corrosion.

Undaunted, through admitting "I have no idea, I'm just making it up," Tom pressed on: perhaps a salt, such as copper nitrate (a blue solid) or, even better, copper carbonate ("It just sounds more white, like sodium bicarbonate") gummed up the works. Maybe, since the heater core was made from aluminum, that was the culprit?

Tom: "What about aluminum carbonate, A-L two C-O three!"
...or, maybe Al₂(CO₃)₃?

Finally, Ray chimed in: "MIT's on Line 1, they want their diploma back."

Happy Saturday,
SAO

Note: I paraphrased this conversation as best I could, since the recording hasn't yet appeared online. When it does, you can hear the full 3/30/13 episode at cartalk.com.

"And Let the Power of Chemistry Do the Work"

I love to listen to NPR on Sunday mornings. They usually recap all the great shows, from Wait, Wait, Don't Tell Me! to Says You. But, I reserve a special place in my heart for Car Talk, the hilarious auto advice show produced by two Boston natives, who dub themselves "Click and Clack."

If this were my car, I wouldn't pour acid on it!
1957 Ford Thunderbird

This morning, a caller wanted advice on a "body problem" with his car. He claimed to have driven by a construction site, and had had concrete inadvertently splashed on the door and window of the passenger's side. The show hosts cracked a few jokes, then mentioned that he could probably scrape the concrete off the window simply using a straight-edge razor blade.


But the door frame was another matter - how do you remove concrete from a painted plastic panel? One of the hosts suggested a simple rubber mallet, but the other mentioned muriatic acid (HCl, or hydrochloric acid). He posited that the acid would seep in and dissolve the concrete, while leaving the underlying paint relatively untouched. The title of this post (see above) summed up his final comments to the caller.


Of course, you might not want to pour HCl over your hood, or the undercarriage...I'm sure mufflers, battery terminals, and engine blocks don't hold up too well to this home remedy!