Chemistry Practice Problems Identifying Acids and Bases Practice Problems Solution: Which solution is most acidic (that is, which one ...

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Solution: Which solution is most acidic (that is, which one has the lowest pH)?(a) 0.10 M HCl(b) 0.10 M HF(c) 0.20 M HF

Problem

Which solution is most acidic (that is, which one has the lowest pH)?
(a) 0.10 M HCl
(b) 0.10 M HF
(c) 0.20 M HF

Solution

We’re being asked to determine the most acidic solution (with the lowest pH). We need to calculate the pH of each of the solutions given.


(a) 0.10 M HCl

HCl is a strong binary acid. When getting the pH of a strong acid solution:

pH=-log [strong acid]pH=-log [HCl] pH=-log [0.10 M]

pH = 1.00


(b) 0.10 M HF

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