1. [H+]/([H+] +10-3.15)[ H2Cit-]
Table 5. Species selected to express the contribution of each conjugate Acid-Base couple to the buffer capacity of
Britton-Robinson buffer and corresponding expressions to be added to the basic equation (71)
Conjugate couple
Selected species
Expression
K+/KOH
KOH
[H+]/([H+] )[ DBA-]
HDBA/ DBA-
DBA-
[H+]/([H+] +10-8)[ DBA-]
H3Cit/ H2Cit-
H2Cit-
[H+]/([H+] )[ H2Cit-]
H2Cit-/ HCit2-
/([H+] )[ H2Cit-]
HCit2-/ Cit3-
HCit2-
10-6.4/([H+] )[ HCit2-]
H3PO4/ H2PO4-
H2PO4-
[H+]/([H+] )[ H2PO4-]
H2PO4-/HPO42-
/([H+] )[ H2PO4-]
HPO42-/ PO43-
HPO42-
/([H+] )[ HPO42-]
H3BO3/ H2BO3-
H2BO3-
[H+]/([H+] )[ H2BO3-]
H2BO3-/ HBO32-
/([H+] )[ H2BO3-]
HBO32-/ BO33-
HBO32-
/([H+] )[ HBO32-]
Maria Michela SALVATORE et al. Do You Know What the Buffer Capacity of Your pH Buffer Is?. World Journal of
Chemical Education, 2017, Vol. 5, No. 2, doi: /wjce-5-2-5
© The Author(s) Published by Science and Education Publishing.