【简答题】向浓度为0.30 mol.dm。的HCl溶液中,通入H2S达饱和(此时H2S的浓度为0.10 mol. dm-3),求此溶液的pH和S2-离子浓度。
【简答题】H2S溶液中 S2-浓度为________。
【判断题】Listen to the monolog ue and decide whether the following statements are true (T) or false (F). Early in the morning and right after lunch are popular meeting times.
【单选题】下列说法中合理的是 [ ]
A.
在Na 2 S溶液中加入AgCl固体,溶液中c(S 2- )会下降
B.
常温下,AgCl在物质的量浓度相同的CaCl 2 溶液和NaCl溶液中的溶解度相同
C.
向0.1 mol/L的ZnCl 2 溶液中通入足量的H 2 S气体,最终得不到沉淀是因为c(S 2- )·c(Zn 2+ )
D.
25℃时,Ksp[Mg(OH) 2 ]=5.61×10 -12 、Ksp(MgF 2 )=7. 42×10 -11 ;则向Mg(OH) 2 悬浊液中加入NaF溶液后,Mg(OH) 2 不可能转化为MgF 2
【判断题】Listening Task 4 Listen to the monolog and decide whether the following statements are true (T) or false (F). 1.Early in the morning and right after lunch are popular meeting times.
【判断题】Task 4 Listen to the monolog and decide whether the following statements are true (T) or false (F). 1. Early in the morning and right after lunch are popular meeting times. .
【单选题】难溶电解质AgCl在浓度为0.01mol/L的下列溶液中,溶解度最小的是( )。
【单选题】下列各组中的比值等于2:1的是( )
A.
pH为12的烧碱溶液与Ba(OH) 2 溶液的物质的量浓度之比
B.
K 2 S溶液中c(K + )与c(S 2- )之比
C.
相同温度下0.2mol/L醋酸溶液与0.1mol/L醋酸溶液中的c(H + )之比
D.
10mL0.5mol/L的盐酸与5mL0.5mol/L的盐酸溶液中的c(H + )之比