Page 1 of 1

homework problem 6B.1

Posted: Sun Dec 09, 2018 12:14 am
by juliefilice 4A
The molar concentration of HCl in hydrochloric acid is reduced to 12% of its initial value by dilution. What is the difference in pH values of the two solutions?
Can someone please help me out on how to start this problem?

Re: homework problem 6B.1

Posted: Sun Dec 09, 2018 12:36 am
by Alana Sur 3B
I assumed the initial conc = 0.1 and final conc = 0.012, calculated both pH separately and then got the difference

Re: homework problem 6B.1

Posted: Sun Dec 09, 2018 12:44 am
by keyaluo4C
Assume that the pH of the initial concentration of HCl is 1.0 mol/L.
Since HCl is a strong acid the concentration of H3O+ is also 1.0 mol/L
pH of initial concentration = - log (1.0) = 0.00.

A dilution to 12% of the initial value would make the concentration of HCl and, in turn H3O+, 0.12 mol/L.
pH of diluted solution = - log (0.12) = 0.92.

Difference in pH values = 0.92 - 0.00 = 0.92