In article ,
Sacha wrote:
I've just read the following gardening tip. Add baking soda to a cup
of your soil and if it bubbles, the soil is acid. Add vinegar and if
it bubbles, the soil is alkaline.

That might work for the most extreme soils, but I doubt that it will
in general. Most soils don't have enough free acid or alkali to
cause obvious bubbles, and you would need to set up a crude gas
collector.

Incidentally, for the culinarily challenged, baking soda is
sodium bicarbonate and NOT baking powder :-)


Regards,
Nick Maclaren.