A solution with a concentration of hydrogen ions higher than 10–7mol/L is acidic, and a solution with a lower concentration is alkaline (another way to say basic). Using the formula, pH=-log[H+], a pH of 7 is neutral, a pH less than 7 is acidic, and a pH greater than 7 is basic.
So this PDF on Hydrogen Ion Concentration is about what makes things acid or alkaline. This is pretty important to gardeners – as well as those interested in purifying water, making soap, or any other of a hundred homestead and basic chemistry chores.
This is not a highly entertaining read, but it is a good technical reference. I used this knowledge to do a down and dirty video on how you can determine if your soil was acidic. I am not a chemist, but I have some chemistry knowledge, enough to both know how important it is, and enough to be dangerous (mostly to myself).
I don’t have any videos on the subject, but before you get into the PDF on Hydrogen Ion Concentration I thought I would share this video to help understand the book.
Being an old Chemistry text, I wanted this video to give some context, I hope this is useful to you.Hydrogen Ion Concentration Vol 1 (1926)