Definition - What does pH Value mean?
A pH Value is a whole number in the range of 1 to 14 which describes the measure of alkalinity or acidity of water soluble substances. If the pH level of any water soluble substance is 7, it is neutral and not considered as an acidic or alkaline substance. Any solution that has a pH value of less than 7 falls in the category of acidic solutions, whereas a solution that has pH value of more than 7 falls in the category of alkaline solutions.
Petropedia explains pH Value
pH is a scientific term that represents "potential of hydrogen" and is one of the important factors in knowing the acidic or alkaline state of a solution. Water is considered as neither acidic nor alkaline because it has a pH value of 7. Thus, it is neutral.
It is important to measure the pH level of petroleum products in order to understand the material used to store them and their reactive behavior when in contact with the atmosphere. One way of checking the pH value of petroleum products is by extracting the product with an equal quantity of 7.0 pH water and checking the pH of the water extract. Crude oil, which is acidic in nature, is mixed with water and if the crude oil is light crude. However, if the crude oil is a heavy crude oil, then a pH meter can be used to check its exact pH value.