The pH Scale:

pH = -log[H₃O ⁺]

in expressing pH, the number to the right of the decimal place should have the same number of significant igures as the original number.

a low value for pH corresponds to a high concentration of H₃O⁺

if [H₃O⁺] = 1.00 ( 3 significant figures ) X 10^-4 M, pH = 4.000 (3 places to the right of the decimal)

pOH = -log [OH^-]

[H₃O⁺][OH^-] = 1.0 X 10^-14

pH + pOH = 14.00

Question .16.

What is the pH of a solution with [H₃O⁺]= 1.0 X 10^-8 M ? what is the pOH ?

Answer16

Question .17.

what is the [H₃O⁺] of a solution with a pH = 3.00 ? What is the pOH ? what is [OH^-] ?

Answer17

Question .18.

what is the pH of a 1.5 X 10^-2 M solution of HCLO₄ ? what is the pOH of this solution ?

Answer18