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dow Help :2 owLv2 Onlir × Calendar x(M Gmail-Free : ×YM Inbox (2)-cmx e chegg Study n/irntakeAssignment/takeCovalentActivity.do?locator-assignment-take&takeAssignment; B 4)) 96% [47 Thu Jul 5 4:56:08 PM Wendell × Use the References to access important values If needed for this question. ited Which of the following aqueous solutions are good buffer systems? O 0.11 M hypochlorous acid + 0.18 M sodium hypochlorite O0.27 M hydrochloric acid + 0.21 M potassium chloride O 0.14 M potassium acetate + 0.25 M acetic acid O 0.31 M ammonium nitrate +0.39 M ammonia 0.35 M nitrous acid +0.21 M sodium nitrite Submit Answer Retry Entire Group 9 more group attempts remaining Previous Next Email Save anExplanation / Answer
Answer:
Buffer solution: It must contain a weak acid and its conjugate base, or a weak base and its conjugate acid.
=> In the given solutions, Hydrochloric acid is only strong acid, => so 0.27M HCl + 0.21M KCl is not a good buffer solution.
=> 0.11M hypochlorous acid + 0.18M sodium hypochlorite is a good buffer solution because hypochlorous acid (HClO) is a weak acid and sodium hypochlorite is its conjugate base of HClO.
Similarly,
=> 0.14 M potassium acetate + 0.25 M acetic acid is good buffer. Since acetic acid is weak acid and potassium acetate is its conjugate base.
=> 0.31 M ammonium nitrate + 0.39 M ammonia is good buffer. Here ammonia is weak base and ammonium nitrate is its conjugate acid.
=> 0.35 M nitrous acid + 0.21 M sodium nitrite is also a good buffer system. Since nitrous acid is weak acid and sodium nitrite is it's conjugate base.
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