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.
An avocadoâs exterior can tell a lot about whatâs happening inside. If you pay attention to the clues its color, texture, and firmness provide, you will select a perfectly ripe avocado each time. Below I describe four methods you can use to tell if an avocado is ripe. A. Skin color. An avocado with a darker skin is often riper than one with a lighter skin. 1  Scan the avocados in front of you.  The avocados with darker green-to-black skin colors may be riper than those with with lighter skins.
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.