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### 12.61

Posted: Tue Nov 29, 2016 12:29 am
problem:Find the initial concentration of the weak acid or base in each of the following aqueous solutions: (a) a solution of HClO with pH 4.60

In the solution manual, it says "Let x=nominal concentration of HClO"
What is the nominal concentration and why do we use this instead of the ICE box?

### Re: 12.61

Posted: Tue Nov 29, 2016 1:36 am
I don't think you have to worry too much about the nominal part. In the problem you are using an ICE table. The nominal concentration (your initial concentration) and the equilibrium is listed in the answers, but I think that the book skipped the change part. You can add it in if you want. Hope this helps!

### Re: 12.61

Posted: Tue Nov 29, 2016 3:30 pm
To solve this question you are still using an ICE box but you are working backwards in order to find the concentration of HClO. Since you are given the pH you can find the concentration of H3O+ and then use that information to find the concentration of HClO.

### Re: 12.61

Posted: Tue Nov 29, 2016 3:57 pm
Jenny and Brandon have good input. Nominal concentration = initial concentration. From this information we can "work backwards" to solve the problem like a "normal" ICE table problem.

### Re: 12.61

Posted: Tue Nov 29, 2016 9:21 pm
How do we find percentage of protonation of solute?