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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 ContinueExplanation / Answer
answer: Hypochlorous acid
Explanation: Hypochlorous acid pKa value = 7.54
we know the acidic buffer pH value from
Henderson-Hasselbalch equation
pH = pKa + log[salt/acid]
in order to get pH value 7.39 the pKa should be nearer to this value .
here pKa = 7.54 for Hypochlorous acid is will give the desired pH = 7.39
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