chap-17-2011W-a

# Ph a solution which resists ph changes which example

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Unformatted text preview: ution which resists pH changes which Example: common A weak acid (HF) + A common ion (F-) H+ HF(aq) + - H (aq) + F (aq) + OH - H 2O OH- pH pH Buffer and Common ion effect The buffer works best when [HF] = [F-] [HF] A buffer solution has the ability to resist changes in pH upon the addition of small addition of amounts of either acid or base. of Common Ion Effect Consider a mixture of salt NaA and weak acid HA. H + (aq) + A - (aq) HA(aq) NaA(aq) → Na + (aq) + A - (aq) [ HA] − log[ H ] = − log K a − log − [A ] [ HA] pH = pK a − log − [A ] [ H + ][ A − ] Ka = [ HA] + [ A− ] pH = pK a + log [ HA] [ HA] [H ] = Ka [ A− ] + [conjugated base] pH = pK a + log [weak acid] HendersonHenderson-Hasselbach Equation Applying HendersonApplying Henderson-Hasselbach Equation What is the pH of a solution containing...
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