The acidic quality of the water has also improved, after previous tests showed it measured 2 on the
pH scale.
Neutral is 7 on the
pH scale. Pure water is measured on the scale as having a pH of 7.0.
The
pH scale ranges from 0 to 14, with ph 7 being neutral.
Because pure distilled water has the same number of hydrogen ions as hydroxyl ions, it rates a neutral 7 on a 0-14
pH scale. Despite the large amounts of water in the human body, normal pH is always slightly alkaline.
Acidity is expressed quantitatively using the
pH scale. Recall that pH is calculated as:
In fact, Drano is at the opposite end of the
pH scale in that the active ingredient is sodium hydroxide (NaOH), more commonly known as lye.
In this sense, beverages are a good application for natural colors because beverages tend to be on the lower
pH scale. Yogurt and ice cream tend to be higher, so therefore the stability of the colors isn't going to be as long, but again, natural colors work in these applications because these products don't have a long shelf life to start."
For comparison, on the logarithmic
pH scale, pure water is neutral at pH 7.0, lemon juice is pH 2.4, and a 30% sulfuric acid solution, such as battery acid, is pH -2.0.
Given that the concentrations of these ions are extremely small, scientists use the
pH scale, which ranges in value from 0 to 14.
Reaction is measured by the
pH scale, as shown in figure 11-1, which gives sample pH values for common substances.
THE
pH scale is used to measure acidity or alkalinity of soil.
The sensors are designed for process industry applications that span the entire
pH scale; have strong chemical concentrations and h igh solids; run at high temperatures and cycle from high to low temperature.