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7 September, 16:09

Which of the following is a buffer system? Which of the following is a buffer system? H2CO3 (aq) and KHCO3 (aq) NaCl (aq) and NaOH (aq) H2O (l) and HCl (aq) HCl (aq) and NaOH (aq) NaCl (aq) and NaNO3 (aq)

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  1. 7 September, 16:13
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    A buffer is defined as an aqueous mixture of a weak acid and its conjugate base or vice versa.

    In the systems:

    H₂CO₃ (aq) and KHCO₃ (aq) : Carbonic acid, H₂CO₃, is a weak acid that, in solution with its conjugate pair, HCO₃⁻ make a buffer system.

    NaCl (aq) and NaOH (aq) : NaCl is a salt and NaOH is a strong base. Thus, this system is not a buffer system.

    H₂O (l) and HCl (aq) : Water is a solvent and HCl a strong acid. This is not a buffer system.

    HCl (aq) and NaOH (aq) : HCl is a strong acid and NaOH a strong base. This is not a buffer system.

    NaCl (aq) and NaNO₃ (aq) : Both NaCl and NaNO₃ are salts and this system is not a buffer system.
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