Multiple choice Which one of the following stands for the symbol pH? Phosphorus and hydrogen content in soil Percentage of Hydrogen in soil Proportion of potash and hydrogen in soil Concentration of hydrogen ions in the soil Reveal answer Fill a bubble to check yourself D Correct answer Explanation The symbol pH stands for 'potential of Hydrogen'. It is a logarithmic scale used to specify the acidity or basicity of an aqueous solution, based on the concentration of hydrogen ions (H+).