HW: 6B.1 (7th)

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Julia Lindner 1I
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HW: 6B.1 (7th)

Postby Julia Lindner 1I » Wed Dec 05, 2018 6:30 pm

"The molar concentration of HCL in hydrochloric acid is reduced to 12% of its initial value by dilution. What is the difference in the pH values of the two solutions?"
I'm having trouble understanding how to start with this problem and how pH and dilution relate to each other. How do you calculate the pH values of the solutions if no values are given for volume, moles, etc?

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Re: HW: 6B.1 (7th)

Postby Chem_Mod » Thu Dec 06, 2018 1:42 pm

The initial concentration of HCl (or H+) is [H+].
The final concentration of HCl is 12% of that, which is .12[H+].
Then use pH final - pH initial to find the change in pH.
Hint: Use log rules to combine the two terms into one term. H+ concentration will cancel out.

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