Howdy,
Red cabbage soup as pH meter was one of my high school chemistry experiments. The tough part was to do the calibration. I remember that the color code results varied wildly amongst the groups in the class, but I don't know what the variation was due to.
Also, even with a calibrated solution, you get rather coarse grained pH readings, probably good within 1.0 pH unit.
My take on it is that it's fun, but not good enough if you actually want to know your water pH.
cheers,
wm_crash, the friendly hooligan
AKA #08840, SAA #162, SVAS #120, HOOLIGAN #1
Wilmington, DE
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