题目

已知H2S为弱酸，关于硫化氢水溶液，下列说法不正确的是( ) A．常温下，pH小于7 B．存在关系式：c(H＋)＝2c(S2－)＋c(HS－)＋c(OH－) C．25 ℃时，由水电离产生的c(H＋)＞1×10－7mol·L－1 D．向溶液中加入少量NaOH固体，c(S2－)增大 答案：C ---Lost and Found office. ________?    --- I wonder if you have a small black suitcase of mine.   A. What can I do for you                        B. Who’s that   C. What’s that                                       D. How do you do