【简答题】已知 298K 时无限稀释的溶液中, Λ m ∞ (KCl)=194.86×10 -4 S.m 2 .mol -1 Λ m ∞ (NaCl) =126.45×10 -4 S.m 2 .mol -1 , 那么在 298K 的水溶液中, Λ m ∞ (K + ) - Λ m ∞ (Na + ) = ( ) S.m 2 .mol -1
【单选题】298 K时,无限稀释的 NH 4 Cl 水溶液中正离子迁移数 t + = 0.491。已知Λm(NH 4 Cl) = 0.0150 S·m 2 ·mol -1 ,则:
A.
λm(Cl - ) = 0.00764 S·m 2 ·mol -1
B.
λm(NH 4+ ) = 0.00764 S·m 2 ·mol -1
C.
淌度 U(Cl - ) = 737 m 2 ·s -1 ·V -1
D.
淌度 U(Cl - ) = 7.92×10-8 m 2 ·s -1 ·V -1
【判断题】A liar always avoid eye contact.
【单选题】298K时,无限稀释的NH 4 Cl水溶液中正离子迁移数t+= 0.491。已知Λm(NH 4 Cl)=0.0150S·m 2 ·mol -1 ,则:()
A.
λm(Cl - )= 0.00764S·m 2 ·mol -1
B.
λm(NH 4 + )= 0.00764S·m 2 ·mol -1
C.
淌度U(Cl - )=&)= 73 m 2 ·S -1 ·V -1
D.
淌度U(Cl - )=&)= 7.92×10-8m 2 ·S -1 ·V -1