Notes
Take for instance the highest point in the curve for pCO2 = 100 mmHg. Assuming [H+] is additive (and hence for equal pCO2, [HCO3 −] is also additive), a [H+] of 6.070848e-07 would result instead of 1.517582e-07, and using this [H+] a new combined SID of 0.01193681 Eq/l would result, but we know it is 0.035 Eq/l, when mixing equal volumes of two fluids with SID 0.01 and 0.06 Eq/l.
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Acknowledgment
P. D. Watson is thanked for the AcidBasics II.
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Ring, T. Mixing bicarbonates: dilution acidosis from first principles. Intensive Care Med 35, 2183–2184 (2009). https://doi.org/10.1007/s00134-009-1668-0
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DOI: https://doi.org/10.1007/s00134-009-1668-0