【简答题】Passage Three:Questions 61 to 65 are based on the following passage.The concept of “environment” is certainly difficult and may even be misunderstood but we have no handy substitute. It seems e...
【单选题】准确称取基准无水碳酸钠5.30g,用水溶解后定容至500.00 mL,则该溶液的准确浓度为[M(Na2CO3)=106.0 g/mol] ( )。
【单选题】标定某盐酸溶液时,准确称取基准无水碳酸钠0.3026g,溶于水,滴定用去盐酸28.88mL,则该盐酸的物质的量浓度为[M(Na 2 CO 3 )=106.0 g/mol ( )。
【单选题】准确称取基准无水碳酸钠5.30g,用水溶解后定容于500.00mL,则该溶液的准确浓度为[M(Na2CO3)=106.0g/mol]
【简答题】Passage Three:Questions 61 to 65 are based on the following passage.It is everyone agrees, a huge task that the child performs when he learns to speak, and the fact that he does so in so short a perio...
【单选题】对于出现“花斑肾”的鸡,应注意降低饲料中()含量。
【单选题】准确称取基准无水碳酸钠5.30g,用水溶解后定容至500.00ml,则该溶液的准确浓度为【M(Na2CO3)=106.0g/mol】( )。
【简答题】2称取基准无水碳酸钠5.3g,用水溶解后准确稀释至500mL,求该溶液的准确浓度?