阅读理解。

     Tom: Hello, Tony. Would you like to go to the football match with Betty and me? 

     Tony: Great idea. Is it in the afternoon or in the evening?

     Tom: It's on Saturday afternoon.

     Tony: Who are in the match?

     Tom: Beijing VS Shanghai. It's at Beijing Stadium.

     Tony: Let's ask Betty. I have her e-mail, it's Betty@hotmail.com .

     Tom: OK. Let's send an e-mail to her.

 阅读对话,判断下列句子的正(T)误(F)

(     )1. There is a basketball match in the afternoon.

(     )2. Tony would like to go to the football match.

( )3. The football match is in Beijing.

(     )4.  Betty has an e-mail.

( )5. Tom is going to make a telephone call to Betty.

求用EDTA滴定Ca²⁺的最高允许酸度。

已知：c( Ca²⁺)=0.01mol/L