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3 values, each with its units, its uncertainty, and where it came from.

Chemistry 3

Molar Mass of Glucose measured

M(C6H12O6)=0.180156 kg/molM(\mathrm{C_6H_{12}O_6}) = 0.180156\ \text{kg/mol}

kg/molThe molar mass of glucose, 180.156 g/mol — the conversion between blood sugar in mg/dL and mmol/L, and the unit of cellular energy accounting.

Second Dissociation Constant of Phosphoric Acid measured

Ka2(H3PO4)=6.32×10−8K_{\mathrm{a2}}(\mathrm{H_3PO_4}) = 6.32 \times 10^{-8}

dimensionlessThe second acid dissociation constant of phosphoric acid at 25 °C, Kₐ₂ = 6.32 × 10⁻⁸, the step that buffers cells and biological media.

Second pKₐ of Phosphoric Acid measured

pKa2(H3PO4)=7.199\mathrm{p}K_{\mathrm{a2}}(\mathrm{H_3PO_4}) = 7.199

dimensionlessThe second pKₐ of phosphoric acid at 25 °C, 7.199 — almost exactly physiological pH, which is why phosphate buffers biology.