Unit 4 Lesson 19

[ H+] and pH

Acidity is determined by the concentration or Molarity of H+ ions n moles per liter. This concentration is symbolized by [H+].

The greater the concentration of H+ ions the lower the pH and it is more acidic.

The hydrogen ion concentration is directly related to the pH of the solution.

The pH number is equal to the exponent just without the negative. This is only true in scientific notation when the coefficient is 1.0.

pH is connected to [H+] through the logarithmic formula pH = -log[H+]

Bases' pH can also be determined because bases contain H+ concentrations. The H+ concentration in scientific notation and the exponent subtracted from 14 is the concentration of OH- ions.

Ex: water - [OH-] is 1.0 X 10^-7 and [H+] is 1.0 X 10^-7 because 7+7=14

Formula: [H+][OH-]= 1 X 10^-14

Practice Problems

3. a) pH 4 b) pH 12 c) pH 6

4. a) pH 2.85 b) pH 13.38 c) pH 7.22 d) pH .82

 

Posted with Blogsy