Compare pH-Values

Calculator for the comparison of two pH-values of acids and bases. The pH-value tells, how acidic or alkaline an aqueous solution is. With a value of 7, it is neutral, that is e.g. the value for pure water. Here, the amount of H₃O⁺ ions is equal to the amount of OH⁻ ions. For smaller values, the solution is acidic (more H₃O⁺), for higher values (more OH⁻) it is alkaline. A change of 1 relates to ten times the strength, an acid with the pH-value of 6 is 10 times more acidic as water, a base with the pH-value of 8 is 10 times more alkaline.
Please enter two values, but not two ratios.

Example: a hydrochloric acid with 32 percent has a pH-value of -1, orange juice of about 3.5. So the hydrochloric acid is more than thirty thousand times as acidic.

pH stands for potential of hydrogen, as the functioning of acids and alkalis in an aqueous solution is based on the exchange of hydrogen ions between the molecules. Acids release a hydrogen atom, while alkalis or bases absorb one. Water is H₂O. When an acid is added to this, oxonium ions, also called hydronium ions, H₃O⁺, are formed. These have absorbed one positively ionized hydrogen atom, i.e., a hydrogen nucleus, but no electron, from the acid. In alkalis, hydroxide ions, OH⁻, are formed, where the hydrogen nucleus has been released and absorbed by the base, but the electron remains.
The pH value used to describe the nature of an aqueous solution was established in 1909 by the Danish chemist Søren Sørensen and is today the best-known, but not the only, system for describing the strength of acids and alkalis. In particular, it only applies to aqueous solutions; if no water is involved, it is not applicable.

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First value (a):
Second value (b):
Ratio strength of acid a to b:
Ratio strength of base a to b: