homework problem 6B.1

juliefilice 4A
Posts: 31
Joined: Fri Sep 28, 2018 12:27 am

homework problem 6B.1

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?

Alana Sur 3B
Posts: 61
Joined: Fri Sep 28, 2018 12:25 am

Re: homework problem 6B.1

I assumed the initial conc = 0.1 and final conc = 0.012, calculated both pH separately and then got the difference

keyaluo4C
Posts: 54
Joined: Fri Sep 28, 2018 12:17 am

Re: homework problem 6B.1

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

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