[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.

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[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+] +10-14.5)[ DBA-] HDBA/ DBA- DBA- [H+]/([H+] +10-8)[ DBA-] H3Cit/ H2Cit- H2Cit- [H+]/([H+] +10-3.15)[ H2Cit-] H2Cit-/ HCit2- 10-4.75/([H+] +10-4.75)[ H2Cit-] HCit2-/ Cit3- HCit2- 10-6.4/([H+] +10-6.4)[ HCit2-] H3PO4/ H2PO4- H2PO4- [H+]/([H+] +10-2.15)[ H2PO4-] H2PO4-/HPO42- 10-7.20/([H+] +10-7.20)[ H2PO4-] HPO42-/ PO43- HPO42- 10-12.15/([H+] +10-12.15)[ HPO42-] H3BO3/ H2BO3- H2BO3- [H+]/([H+] +10-9.25)[ H2BO3-] H2BO3-/ HBO32- 10-12.75/([H+] +10-12.75)[ H2BO3-] HBO32-/ BO33- HBO32- 10-13.80/([H+] +10-13.80)[ 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, 53-70. doi:10.12691/wjce-5-2-5 © The Author(s) 2015. Published by Science and Education Publishing.