Which of the following aqueous solutions are good buffer systems? a. 0.34 M calcium iodide + 0.22 M sodium iodide. b. 0.2

Question

Which of the following aqueous solutions are good buffer systems?

a. 0.34 M calcium iodide + 0.22 M sodium iodide.
b. 0.27 M ammonia + 0.38 M ammonium nitrate.
c. 0.27 M nitric acid + 0.18 M sodium nitrate.
d. 0.18 M hydrofluoric acid + 0.14 M hydroiodic acid.
e. 0.14 M calcium hydroxide + 0.28 M calcium chloride.

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Calantha 1 year 2021-07-21T06:13:22+00:00 1 Answers 0 views 0

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    2021-07-21T06:14:54+00:00

    Answer:

    b. 0.27 M ammonia + 0.38 M ammonium nitrate.

    Explanation:

    Hello there!

    In this case, according to the given information, it turns out possible for us to bear to mind the fact that buffest must be prepared by using either of the following pairs:

    weak acid/conjugate base

    weak base/conjugate acid

    So that the pH might be set constant. In such a way, since a. shows two salts, c. a strong acid with a neutral base, d, shows two acids and e. a strong base with a neutral base, we infer the correct buffer is b. 0.27 M ammonia + 0.38 M ammonium nitrate because it has a weak base (ammonia) and its conjugate acid, ammonium.

    Regards!

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