A buffer solution is prepared by adding NaC2H2O2 to a solution of HC2H2O2 (acetic acid). HC2H3O2(aq) = H+ (aq) + C2H302 – (aq) What happens

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A buffer solution is prepared by adding NaC2H2O2 to a solution of HC2H2O2 (acetic acid). HC2H3O2(aq) = H+ (aq) + C2H302 – (aq) What happens if KCl is added

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Thanh Thu 5 years 2021-08-09T09:37:56+00:00 1 Answers 26 views 0

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  1. lethu
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    2021-08-09T09:39:32+00:00
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    Answer:

    pH is not been modified. No changes.

    Explanation:

    Our buffer is made of acetic acid, a weak one and the salt from its conjugate base, sodium acetate.

    NaC₂H₃O₂ → Na⁺   +  C₂H₃O₂⁻

    The acetate anion can make hydrolisis in water to produce acetic acid again.

    C₂H₃O₂⁻  + H₂O  ⇄  C₂H₃O₂H + OH⁻     Kb

    KCl is neutral salt. When we dissociate it:

    KCl → K⁺  +  Cl⁻

    Both ions come from a strong base and a strong acid. They won’t make hydrolisis in water because they are conjugate weak acid and base

    K⁺ + H₂O ← KOH + H⁺

    Cl⁻ + H₂O ← HCl + OH⁻

    These reactions can’t be possible.

    That’s why it doesn’t occur anything in our buffer, this salt does not give OH⁻ or H⁺ to medium to modify pH

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