Lucy, Charles A. creator text Washington DC :American Chemical Society ,2023 monographic eng

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2418-2422p. Abstract: A survey of 21 free online buffer calculators and apps found only 2 that correctly calculated pH under conditions where [H+] and [OH–] cannot be ignored in the ratio term of the Henderson–Hasselbalch equation. Traditional guidelines for when use of formal concentrations is acceptable were found to be flawed. For acidic (pKa ≤ 7) buffers, the use of formal concentrations is valid when FA–/Ka > 20. For alkaline (pKa ≥ 7) buffers, the approximation is valid when FBH+/Kb > 20. Robust equations for predicting pH of acidic and alkaline buffers are presented, which could be used with programmable calculators and should be used for online buffer calculators and apps. ***______{For Hard Copy, Please visit Library.}________*** Buffers| Acid−Base Chemistry| Analytical Chemistry| General Chemistry 0021-9584 https://pubs.acs.org/doi/10.1021/acs.jchemed.2c01203 https://pubs.acs.org/doi/10.1021/acs.jchemed.2c01203 231027 20231027123444.0