The effect of magnetic field on the rate constant of reaction for potassium ferricyanide with ascorbic acid has been studied within the temperature range of 298.15～313.15K.The results show that the rate constant of r...The effect of magnetic field on the rate constant of reaction for potassium ferricyanide with ascorbic acid has been studied within the temperature range of 298.15～313.15K.The results show that the rate constant of reaction for potassium ferricyanide with ascorbic acid is evidently increased under the optimum magnetic field.The decreasing values of activation enthalpy and entropy are 12.74kJ·mol -1 and 38.99J·mol -1 ·k -1 .The cause of the effect of magnetic field on the reaction rate of potassium ferricyanide with ascorbic acid was discussed.展开更多
Solubilities of ammonium tetraphenylborate (NH4BPh4) in water- t- butyl alcohol (TBA) mixed solvents at 283.15,293.15,298.15,303.15 and 308.15 K have been determined by spectrophotometry.The standard Gibbs energy of t...Solubilities of ammonium tetraphenylborate (NH4BPh4) in water- t- butyl alcohol (TBA) mixed solvents at 283.15,293.15,298.15,303.15 and 308.15 K have been determined by spectrophotometry.The standard Gibbs energy of transfer (Δ G t) of NH4BPh4 from water to H2O- TBA mixtures and the primary medium effect of NH4BPh4 from 283.15 to 308.15 K were studied.The results show that－Δ G t exhibits a complicated variation pattern with the increase in the mole fraction of TBA [x(TBA)] at the same temperature .When x(TBA) < 0.06,－Δ G t increases very slowly with x(TBA),the－Δ G t increases rapidly with x(TBA) when x(TBA) from 0.06 to 0.2.For x(TBA)> 0.2,the－Δ G t decreases with increasing x(TBA).The largest value of －Δ G t occurs at x(TBA) = 0.2.The main reason for this variation was analyzed and discussed.展开更多
文摘The effect of magnetic field on the rate constant of reaction for potassium ferricyanide with ascorbic acid has been studied within the temperature range of 298.15～313.15K.The results show that the rate constant of reaction for potassium ferricyanide with ascorbic acid is evidently increased under the optimum magnetic field.The decreasing values of activation enthalpy and entropy are 12.74kJ·mol -1 and 38.99J·mol -1 ·k -1 .The cause of the effect of magnetic field on the reaction rate of potassium ferricyanide with ascorbic acid was discussed.
文摘Solubilities of ammonium tetraphenylborate (NH4BPh4) in water- t- butyl alcohol (TBA) mixed solvents at 283.15,293.15,298.15,303.15 and 308.15 K have been determined by spectrophotometry.The standard Gibbs energy of transfer (Δ G t) of NH4BPh4 from water to H2O- TBA mixtures and the primary medium effect of NH4BPh4 from 283.15 to 308.15 K were studied.The results show that－Δ G t exhibits a complicated variation pattern with the increase in the mole fraction of TBA [x(TBA)] at the same temperature .When x(TBA) < 0.06,－Δ G t increases very slowly with x(TBA),the－Δ G t increases rapidly with x(TBA) when x(TBA) from 0.06 to 0.2.For x(TBA)> 0.2,the－Δ G t decreases with increasing x(TBA).The largest value of －Δ G t occurs at x(TBA) = 0.2.The main reason for this variation was analyzed and discussed.
