Abstract
The determination of the second dissociation constant of carbonic acid in 15 mass% glucose-water mixed solvent, K 2, has been made on cell of the type: Pt, H 2 (101.325 kPa) |Na 2CO 3 ( m 1), NaHCO 3 ( m 2), NaCl ( m 3), 15 mass% glucose+water| AgClAg at 278.15–318.15 K. The dependence of p K 2 on temperature has been obtained, that is, pK 2 = −52.01 + 9561.2 T + 9.955 × 10 −2T . The maximum value of K 2 in the mixed solvent is found to occur at 310.0 K and the value of p K 2 is 9.683 at this temperature. However, the maximum value of K 2 in pure water occurs at 349.3 K and p K 2 (W) = 10.121. It is evident that HCO − 3 species increases in acidic strength and that the temperature occurred maximum value of K 2 decreases when glucose is added to a solvent that is initially pure water.
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