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17 January, 13:00

Which set of compounds would form a buffer in aqueous solution? drag each item to the appropriate bin. hints?

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  1. 17 January, 13:25
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    This question requires a list of set of compounds (answer choices) from which choose the set that would form a buffer is aqueous solution.

    I found this list:

    1) HCN and NaCN

    2) HCN and HCl

    3) HCl and NaOH

    4) NaCN and NaOH

    Now you must apply the rules to determine which pairs may form a buffer solution.

    A buffer solution is a mixture of a weak acid with its conjugate-base or a mixture of a weak base with its conjugate base.

    You can disscard quickly 2, 3, and 4 because HCl is a strong acid, and NaOH is a strong base.

    So, the only option is the first one:HCN and NaCN.

    Indeed HCN is a weak acid and CN - is its conjugate base, so they will form a buffer.

    Other set of compounds that would form a buffer, and tha is frequent in this kind of questions, is:

    HF (a weak acid) and NaF (F - is the conjugate-base of HF).
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