【多选题】下列说法正确的是( )
A.
常温下pH为5的盐酸溶液稀释1000倍后,pH等于8
B.
浓度均为0.1mol/L的氨水和氯化铵溶液,水电离出的c(H + )前者小于后者
C.
碳酸钠溶液中存在:c(Na + )=2c(CO 3 2- )+c(HCO 3 - )+c(H 2 CO 3 )
D.
等物质的量浓度的CH 3 COOH溶液与KOH溶液任意比混合:c(K + )+c(H + )=c(OH - )+c(CH 3 COO - )
【单选题】下列说法正确的是
A.
常温下pH为5的盐酸溶液稀释1000倍后,pH等于8
B.
浓度均为0.1 mol/L的氨水和氯化铵溶液,水电离出的c(H + )前者小于后者
C.
碳酸钠溶液中存在:c(Na + )+c(H + )= c(CO 3 2— )+c(OH — )+c(HCO 3 — )
D.
等浓度的CH 3 COOH与KOH以任意比混合: c (K + )+ c(H + )> c(OH — )+ c (CH 3 COO - )
【单选题】NEWS REPORT 1 1 What’s the news report mainly about? A . Health conditions of young adults. B . Job opportunities of young adults. C . Earning potentials of young adults. D . Marriage conditions of yo...
【单选题】We have performed all these researches for the( )goal of finding an effective cure for this disease.
【单选题】The author's analogy between cancer and murder is made in order to show ______.
A.
the lack of perfect solution to the present problems
B.
the new discovery of modern science
C.
the necessity of doing nothing till an ultimate cure is available
D.
the availability of adequate punishment
【单选题】pH=1和pH=5的两种盐酸溶液等体积混合,其溶液的pH是()。
【单选题】太极拳的来源综合吸收了哪代名家拳法?()