Quote:
Originally posted by Shazaam!
...
Here’s a simple test.
Draw a small amount of battery acid and put the particles in it. Battery acid is dilute sulfuric acid, so when you add chromium to it you’ll get a release of hydrogen bubbles and the chromium will turn the darker violet color of chromium sulfate. Aluminum doesn’t react.
For you chemistry majors:
2Cr + 3H2SO4 > Cr2 [SO4]3 + 3H2 |
A further test to confirm this - using a match, apply a small flame to the gas that's given off. If H2 (Hydrogen gas) is being produced, you'll hear a "pop" (and the walls and roof of your garage will disappear).
NB. Do not really try this!
16-Sep-2004, 19:28 
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