Problem: Which combination is the best choice to prepare a buffer with a pH of 5.0?a) HNO2;NaNO2 (pKa for HNO2 is 3.33)b) C5H5N; C5H5NHCl (pKb for C5H5N is 8.76)c) HCHO2; NaCHO2 (pKa for HCHO2 is 3.74)d) NH3; NH4Cl (pKb for NH3 is 4.75)

FREE Expert Solution

Identify the combination that is the best choice to prepare a buffer with a pH of 5.0.

The maximum buffering capacity of a solution is when the pH of the solution is equal to pKaand the buffer range of a solution is pH = pKa ± 1

 maximum buffering capacity:              pH = pKa

 buffering range:              pH = pKa ± 1


Get the pKa of each:


a) HNO2;NaNO2 (pKa for HNO2 is 3.33)

pKa = 3.33



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Problem Details

Which combination is the best choice to prepare a buffer with a pH of 5.0?

a) HNO2;NaNO2 (pKa for HNO2 is 3.33)

b) C5H5N; C5H5NHCl (pKb for C5H5N is 8.76)

c) HCHO2; NaCHO2 (pKa for HCHO2 is 3.74)

d) NH3; NH4Cl (pKb for NH3 is 4.75)

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