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session masteringchemistry.com Mastering Chemistry: Course Home Mastel gCh try: Homework 4 CHE 134: General Chemistry Ill Homework 4 For Practice 18.5 For Practice 18.5 Part A Which acid would you choose to create a buffer with pH-7.39? chlorous acid (HClO pKa 1.95 formic acid (HCHO2) nitrous acid (HNO pKa 334 hypochlorous acid (HClO) pK 7.54 O chlorous acid O nitrous acid O formic acid O hypochlorous acid Submit My Answers Give U Part B This question will be shown after you complete previous question(s). Search Q&A; Chegg.com Signed in as Nicole Jazdzewski I Help Close Resources previous l 3 of 11 l next Provide Feedback Continue

Explanation / Answer

If you have to make up a buffer solution of a certain pH, it's fairly simple to decide on a weak acid to use to make the buffer. Consider the equation for the [H+] of a buffer

[H+] = Ka*(nHA/nA-)

to adjust the pH of a buffer solution:

Pick a weak acid with a pKa close to the pH you want.

so hypochlorous acid has pKa(7.54) close to pH (7.39) .

Answer is hypochlorous acid ( HClO)

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