On Jun 17, 12:33*pm, M Q wrote:
Don Young wrote:
"bent" wrote in message
...

Ok, anybody want to attempt to splain to me why there is both a "pH"
(6.2-8.4) and a "Total Alkalinity" (0-240 ppm) scale on a pool water
chemical test strip kit . I have been using the strips that have the 4
square foam pads on the ~1/4" x 4" plastic strip that you dip in the
water, wait and then compare the colours change on the pads to the
reference colours on the label of the strips' bottle. The strips have a
colour range for Total Bromine (0-20 ppm), Free Chlorine (0-10 ppm), pH,
and Alkalinity. Granted, it is likely that the strips I currently have are
technically past the expiration date, and I will get some new ones soon,
but firstly just to compare the results of the test between the old strips
and new strips, so I cna finish them off. Any comments on how off they can
get with age?

This is my problem - ngQ(uestion):

I was taut in skool that pH and alkalinity was the same scale. The number
is determined from the definition regarding the hydronium ion
concentration, and math or something like that. The pH of neutral water is
about 7. That it, it is neither acidic nor base in its chemical character.