Answer:
The answer to your question is H⁺
Step-by-step explanation:
pH measures the H⁺ concentration, with this variable is possible to know the acidity or alkalinity of a solution.
The pH scale is from 0 to 14.
If a solution has a pH between 0 and 6.9 it is consider an acidic solution.
If a solution has a pH between 7.1 and 14 it is consider an alkali.
If a solution has a pH of 7, it is a neutral solution.
Sometimes is used OH⁻ which measures the concentration of OH ions in a solution, and is represented by pOH.