Buffer capacity depends on the concentration of the

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Unformatted text preview: is a significant change in pH. • Buffer capacity depends on the concentration of the concentration buffering reagents. Buffer system : HA / A − [ H A] [H ] = Ka [ A− ] + [A - ] pH = pK a + log [HA] The greater the amounts of conjugate acid-base pair, greater amounts of acidgreater capacity the greater the buffer capacity. pH = pK a ± 1 A buffer is most effective when the buffering pair has most equal equal capacity to counteract additional H+ or OH- Predict Predict the most effective pH range for each pair of buffer agents. pH = pK ± 1 a Effective pH? pK a ±1 3.17 3.35 4.20 4.74 7.52 9.31 9.89 3.74 to 5.74 (a) Find the pH of a buffer that is 0.350 M in formic acid and 0.400 M in sodium formate? Ka= 1.8 × 10-4. pH pH = pKa + log ([A-1]/...
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This document was uploaded on 02/26/2014.

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