homework problem 6B.1

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

homework problem 6B.1

Postby juliefilice 4A » Sun Dec 09, 2018 12:14 am

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?

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

Re: homework problem 6B.1

Postby Alana Sur 3B » Sun Dec 09, 2018 12:36 am

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

Postby keyaluo4C » Sun Dec 09, 2018 12:44 am

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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