Consider two acids: HCO2H (formic acid, pKa = 3.8) and pivalic acid [(CH3)3CCO;H, pK = 5.UJ. (a) Which acid has the larger K? (b) Which acid is the stronger acid? (c) Which acid forms the stronger conjugate base? (d) When each acid is dissolved in water, for which acid does the equilibrium lie further to the right?

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Chapter16: Acid-base Equilibria
Section: Chapter Questions
Problem 16.157QP: Weak base B has a pKb of 6.78 and weak acid HA has a pKa of 5.12. a Which is the stronger base, B or...
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Consider two acids: HCO2H (formic acid, pKa = 3.8) and pivalic acid [(CH3)3CCO,H, pK = 5.0].
(a) Which acid has the larger K? (b) Which acid is the stronger acid? (c) Which acid forms the
stronger conjugate base? (d) When each acid is dissolved in water, for which acid does the
equilibrium lie further to the right?
%3D
The pKa values in Table 2.1 span a large range (-7 to 50). The pK, scale is logarithmic.
small difference in pK, translates into a large numerical difference, For example, the diffe
between the pK, of NH3 (38) and CH2=CH, (44) is six pKa units. This means that NH, is
one million times more acidic than CH,=CH,.
Transcribed Image Text:Consider two acids: HCO2H (formic acid, pKa = 3.8) and pivalic acid [(CH3)3CCO,H, pK = 5.0]. (a) Which acid has the larger K? (b) Which acid is the stronger acid? (c) Which acid forms the stronger conjugate base? (d) When each acid is dissolved in water, for which acid does the equilibrium lie further to the right? %3D The pKa values in Table 2.1 span a large range (-7 to 50). The pK, scale is logarithmic. small difference in pK, translates into a large numerical difference, For example, the diffe between the pK, of NH3 (38) and CH2=CH, (44) is six pKa units. This means that NH, is one million times more acidic than CH,=CH,.
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