HClO has pKa =7.53. How is it acid if its pH is >7

Moderators: Chem_Mod, Chem_Admin

Chem_Mod
Posts: 17662
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 404 times

HClO has pKa =7.53. How is it acid if its pH is >7

Postby Chem_Mod » Sun Aug 21, 2011 12:07 pm

HClO which has a pKa of 7.53. How is it an acid if its pH is greater than 7? Is it dependent on whether is a proton donor rather than the pH?

Chem_Mod
Posts: 17662
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 404 times

Re: HClO has pKa =7.53. How is it acid if its pH is >7

Postby Chem_Mod » Sun Aug 21, 2011 12:07 pm

You are confused between pH and pKa which are very different. pKa tells the degree of dissociation of an acid. pKa= -logKa and Ka = [H3O+]*[A-]/[HA]. The smaller the the pKa, the larger the Ka meaning the acid is strongly dissociated into H3O+. So indeed HClO is a strong acid compare to HBrO (pKa = 8.69). In order to determine the pH of a HClO solution, you need to know the concentration of H3O+ in that solution because pH = -log[H3O+].


Return to “Conjugate Acids & Bases”

Who is online

Users browsing this forum: No registered users and 1 guest