Compare the hydronium ion concentration of the solution having a pH of 2.0 to the hydronium ion concentration of the other solution given to the student.

pH is a scale used to measure the acidity or alkalinity of an aqueous solution. It can be used to calculate the amount of hydronium ions in the solution. It is expressed as the negative logarithm to the base 10 of the concentration.

pH = - log [H+]

2.0 = - log [H+]

[H+] = 0.01 M