The total Carbon dioxide content (HCO3 + CO2) in a blood sample is determined by acidifying the sample and measuring the volume of CO2 evolved with a Van Slyke manometric apparatuses. The total concentration was determined to be 28.5 mmol/L. The blood pH at 37 C was determined to be 7.48. What are the concentrations of HCO3 and CO2 in the blood? pKa = 6.10