On Oct 25, 2009, at 10:04 AM, Jwlehman@aol.com wrote: In a message dated 10/25/2009 8:02:02 AM Central Daylight Time, list@ginda.us writes: Neutral pH is 7.0. 6.8 is ever-so-slightly acid. Yes, neutral is the center of the range, not "no effect". Different substances that measure the same pH can have a different effect when you mix them with the same thing, as pH measures the ratio of positive to negative ions, but some substances have more free (or free-able) ions than others. Some weak acids (or bases) have a strong "buffering" capacity, meaning they blunt the impact of other acids and bases and tend to maintain a pH close to their own regular pH. Soil chemistry and pH are very complicated, and pH is at best a rough measure of the type of soil you have and what's likely to grow there. Ginda (who is remembering her high school chemistry) |
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