Question

what is the hydronium ion concentration of a solution whose ph is 4.12?

Answer 1

pH is a measurement of acidity of a solution. It is related logarithmically with the hydrogen ion concentration. The relation is expressed as:

pH = -log [H+]
4.12 = -log [H+]
10^-4.12 = [H+]
[H+] = 7.59x10^-5

Hope this answers the question.