Problem:

pH expresses the molar concentration of hydronium ions in an aqueous solution on a logarithmic scale. (Note that it is common to use the hydrogen ion, H+, to represent the hydronium ion, H3O+.)

pH = -log[H3O+]

[H3O+] = 10-pH

As pH decreases, acidity increases. As pH increases, acidity decreases.

Acidic solution: pH < 7
Neutral solution: pH = 7
Basic solution: pH > 7

Question: What is the pH of an aqueous solution with the hydronium ion concentration : [H3O+] = 6.3 x 10-6M ?

Show your all work.

Buttermilk is the milk that remains after churning milk into butter . It a recipe calls for buttermilk, you can make a substitute by adding 1 tablespoon vinegar (dilute acetic acid) to 1 cup of milk. Buttermilk has a pH of 4.63.

Question: What is the molar concentration of [H3O+] in buttermilk?

Please show your calculation srep by step.