Question

pH scale ranges from :
(A) 7-14
(B) 0-12
(C) 0-14
(D) 0-7

Answer 1

Hint: The pH test measures the amount of hydrogen ions that exists in a given solution. High concentrations of hydrogen ions yield a low pH (acidic substances), whereas low levels of hydrogen ions result in a high pH (basic substances).

Complete step by step answer:
The pH scale ranges from 0-14. The pH of a solution is a measure of its acidity or alkalinity (base). The popularly known and used litmus paper, that has been treated with a natural water-soluble dye so it can be used as a pH indicator, to test how much acid or base (alkalinity) exists in a solution. The overall concentration of hydrogen ions is inversely related to its pH and can be measured on the pH scale. Therefore, the more hydrogen ions present, the lower the pH; conversely, the fewer hydrogen ions, the higher the pH. A change of one unit on the pH scale represents a change in the concentration of hydrogen ions by a factor of 10, a change in two units represents a change in the concentration of hydrogen ions by a factor of 100. Thus, small changes in pH represents large changes in the concentration of hydrogen ions. Pure water is neutral.It is neither acidic nor basic, and has a pH of 7.
So, the correct answer is “Option D”.

Note: Anything below 7 (ranging from 0.0 – 6.9) is acidic, and anything 7.0 ( from 7.1 – 14.0) is alkaline. The blood in your veins is slightly alkaline (pH=7.4) . The environment in your stomach is highly acidic ( pH= 1 to 2). Orange juice is mildly acidic (pH = 3.5), whereas baking soda is basic (pH=9.0).