- 作者: 潘貫
- 作者服務機構: Contribution from the Department of Chemistry, National Taiwan University
- 中文摘要:
(1) The solubility product of silver chromate was determined from e.m.f. of the cell,
Ag;Ag2CrO4(s)∣K2CrO4(x)m ∥ KNO3(m)∥AgNO3(3x)m ∣Ag2Cro3(s);Ag+
∣K3NO3(1-3x)m∥ ∥KNO3(1-3)m∣
By extrapolation of the function,
(E - 2k log 3 - 3k log xm) x=0 + 3kα√2m=-k log K s.p. to x=0 and then m=0. K s.p. in the temperature range of 20° to 40℃ is expressed by
log Ks.p. = 0.5343 - 3437/T - 3.04 × 10¯3T.
(2) The molal heat of solution of silver chromate was evaluated from the temperature coefficient of In Ks.p. and given by
△ H° = 15,727 - 1.39 × 10¯2 T2.
(3) The standard potential of the Ag; Ag2CrO4 (s), CrO4¯ electrode was evaluated from E° = π°Ag:Ag+ - k log K2.p.. it is given by
E° = -0.4472 + 1.1× 10¯3 (t-25) +4 × 10¯7 (t-25)2.
(4) The molal free energy change for solution of Ag2CrO4(s) is given by
△ F° = 15,727 - 2.445T + 1.39 × 10¯2 T2.
(5) The molal heat, free energy and entropy change of formation of silver chromate from its elements at 25℃ were evaluated. - 英文摘要: --
- 中文關鍵字: --
- 英文關鍵字: --