【单选题】已知25℃时,K a (HF)=3.6×10 -4 , K sp (CaF 2 )=1.46×10 -10 。现向1 L 0.2 mol·L -1 HF溶液 中加入1 L 0.2 mol·L -1 CaCl 2 溶液,则下列说法中,正确的是 ( )
A.
25℃时,0.1 mol·L -1 HF溶液中pH=1
B.
K sp (CaF 2 )随温度和浓度的变化而变化
【单选题】What will the future be like when everybody gets online?
A.
People will be living in two different realities
B.
People will have equal access to information.
C.
People don’t have to travel to see the world.
D.
People don’t have to communicate face to face.
【判断题】民事诉讼法律关系的主体是指在民事诉讼中依法享有的诉讼权利和承担诉讼义务的法院、检察院、当事人和其他诉讼参与人。
【简答题】以原点O向直线l作垂线,垂足为点H(-2,1),则直线l的方程为______.
【单选题】已知25℃时, K a (HF)=3.6×10 - 4 , K sp (CaF 2 )=1.46×10 - 10 。现向1 L 0.2 mol·L - 1 HF溶液中加入1 L 0.2 mol·L - 1 CaCl 2 溶液,则下列说法中,正确的是
B.
25℃时0.2mol·L - 1 HF溶液中pH=2
C.
K sp (CaF 2 )随温度和浓度的变化而变化
【多选题】When will the future value increase?
A.
The compounded term becomes shorter
B.
The compounded term becomes longer
C.
The compounded interest rate decreases
D.
The compounded interest rate increases
【单选题】向1 mol 酒石酸〔HOOC(CHOH) 2 COOH〕中加入1 L 1 mol·L -1 的KOH溶液,得最大量沉淀,再向其中加入1 L 1 mol·L -1 KOH溶液时,沉淀完全溶解。与此有关的下列叙述错误的是( )