The PH of a solution can be measured using the H+ ions concentration present in the solution. PH= -log(H+) H+ is the hydrogen ion concentration. or by knowing the OH- ion concentration. PH= 14- (-log(OH-)-log(OH-) is the pOH of the solution.
If you see a brown patch under the stem it's going to be a little gross inside. If you see a nice yellow-green patch you have a perfectly ripe avocado. Just make sure nobody at the grocery store notices you flicking the stems off a ton of avocados.
The Black Avocado. The black avocado is the type of avocado that is the most common, and that is primarily the handiwork of one Rudolph Hass, an amateur horticulturist and mail carrier from California. His surname serves as the name by which many black avocados are referred to these days--the Hass avocado.here really aren't that many differences between green avocados and black ones. The Green Avocado. The green avocado is not as common or popular as the black avocado, but it is still bred by quite a few growers. Among the types of avocados, the Gwen, Pinkerton and Reed varieties are the most popular.