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8 November, 14:50

A solution containing which one of the following pairs of substances will be a buffer solution?

a. RbCl, HCl

b. CsF, HF

c. KBr, HBr

d. NaI, HI

e. none of the above

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Answers (1)
  1. 8 November, 18:30
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    Answer: The pairs of molecules which can form buffer solution are CSF, HF.

    Explanation:

    A buffer solution can only be formed by substances which are either weak acid or weak bases and mixing them with there corresponding conjugate base or conjugate acid.

    Since HCl is a strong acid so the buffer solution cannot be formed using this strong acid. RbCl would provide the conjugate base anion Cl⁻ but this solution of HCl and RbCl cannot form buffer as HCl is a strong acid.

    Since HF is a weak acid and hence it can form a buffer solution by mixing this weak acid with its conjugate base anion F⁻So a solution of HF and CsF would form a buffer solution. CsF would provide F⁻ ion.

    HBr is also a strong acid and hence it will also not be able to form buffer solution on mixing it with its conjugate base anion Br⁻.

    HI is very strong acid and hence it would not be able to form buffer solution on mixing it with its conjugate base anion I-.
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