问题 选择题

常温下,0.2 mol/L CH3COOH溶液与0.1 mol/L NaOH溶液等体积混合后(忽略混合前后溶液体积的变化),溶液的pH<7,则下列有关此溶液的叙述正确的是

A.溶液中由水电离产生的H浓度为1×107 mol/L

B.c(CH3COO)+c(CH3COOH)-c(Na)=0.05 mol/L

C.溶液中CH3COOH的电离程度小于CH3COONa的水解程度

D.溶液中离子浓度的大小关系为:c(Na)>c(CH3COO)>c(H)>c(OH)

答案

答案:B

混合溶液为0.05mol/L CH3COOH、0.05mol/LCH3COONa,溶液的pH<7,说明

CH3COOH电离程度大于CH3COO的水解程度,C 错误;

溶液中离子浓度的大小关系为: c(CH3COO)>c(Na)>c(H)>c(OH)  D 错误。

醋酸电离抑制了水的电离,溶液中由水电离产生的H浓度小于1×107 mol/L,A 错误。

c(CH3COO)+c(CH3COOH)="0.1" mol/L,c(Na)=0.05 mol/L,c(CH3COO)+c(CH3COOH)-c(Na)=0.05 mol/L,B 正确。

单项选择题

(A)

Arthur Miller (1915-2005) is universally recognized as one of the greatest dramatists of the 20th century. Miller’s father had moved to the USA from Austria-Hungary, drawn like so many other by the "Great American Dream." However, he experienced severe financial hardship when his family business was ruined in the Great Depression of the early 1930s.

Miller’s most famous play, Death of a Salesman, is a powerful attack on the American system with its aggressive way of doing business and its insistence on money and social status as indicators of worth. In Willy Lowman, the hero of the play, we see a man who has got into double with his worth. Willy is "burnt out" and in the cruel world of business there is no room for sentiment: if he can’t do the work, then he is no good to-his employer, the Wagner Company, and he must go. Willy is painfully aware of this, and at loss as to what to do with his lack of success. He refuses to face the fact that he has failed and kills himself in the end.

When it was first staged in 1949, the play was greeted with enthusiastic reviews, and it won the Tony Award for Best Play, the New York Drama Critics’ Circle Award, and the Pulitzer Prize for Drama. It was the first play to win all three of these major awards.

Miller died of hear failure at his home in Roxbury, Connecticut, on the evening of February 10, 2005, the 56th anniversary of the first performance of Death of a Salesman on Broadway.

After it was first staged, Death of a Salesman()

A. achieved huge success

B. won the first Tony Award

C. was warmly welcomed by salesmen

D. was severely attacked by dramatists

多项选择题