1.污水試樣5ml先加蒸餾水稀釋為500ml,測得含氧量8.0ppm, 5日後再測其含氧量為4.0ppm,則此污水之BOD值為:
A. 4ppm B. 40ppm C. 200ppm D. 400ppm
2.0.3M之CH3COOH溶液(Ka=2.0x10^-5)1L中,需加入多少莫耳
之NaOH,可得PH=5之緩衝溶液 (log2=0.3):
A. 0.2 B. 0.3 C. 0.4 D. 0.15
以上二題請詳解,THANKS!!
收錄日期: 2021-05-01 13:04:50
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20130824000015KK02719