What is the Ph and is it basic or acidic ?

Question

1. [H3O+] = 4.33 x 10^-7
2. [OH] = 3.33 x 10^-9
3. pH= 12.3 [H3O+]=
4. pOH = 4.46 [H3O+] =

Answer 1

Learn/memorize the following relationships:

pH = -log [H3O⁺]

pOH = -log [OH^-]

pH + pOH = 14

[H3O⁺][OH^-] = 1x10^-14

(1) pH = -log 4.33x10^-7 = 6.36 acidic b/c pH <7

(2) pOH = -log 3.33x10^-9 = 8.48 and pH = 14 - pOH; pH = 5.52 acidic b/c pH <7

(3) [H3O⁺] = 1x10^-12.3; [H3O⁺] = 5.01x10^-11 M basic b/c pH >7

(4) pH + pOH = 14; pH = 14 - 4.46 = 9.54; [H3O⁺] = 1x10^-9.54 = 2.88x10^-10 basic b/c pH >7