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Title: Calculating the ratio of HCO3- to H2CO3 in the patient?s blood ? Post by: rivera5454 on Feb 15, 2013 Calculate the ratio of HCO3- to H2CO3 in the patient?s blood 10 hours after the ingestion of the aspirin (pH = 7.55). The Ka1 for H2COis 4.4 x 10-7.
Thanks in advance Title: Calculating the ratio of HCO3- to H2CO3 in the patient?s blood ? Post by: tony1653 on Feb 15, 2013 You just have to know the definition of Ka.
Ka = [H+][A-] / [HA] where HA is the protonated acid and A- is the conjugate base. In this case with carbonic acid, it is: Ka = [H+][HCO3-] / [H2CO3] which can be re-arranged to: [HCO3-] / [H2CO3] = Ka / [H+] You are given Ka. You can figure out [H+] from the definition of pH: pH = -log[H+] which can be re-arranged to: [H+] = 10^ (-pH) |