Question

Aflati cat este concentratia molara a unei solutii de acid acetic cu constanta de aciditate de 10^-5 si ph=4.

Answer 1

acid acetic = acid slab

=> [H+] = $\sqrt{Cm*Ka}$

pH = -lg[H+] => [H+] = 10la-pH = 10la-4

=> (10la-4)² = Cm*10la-5

=> Cm = 10la-8/10la-5

=> Cm = 10la-3 mol/L = 0,001 M