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【简答题】
称取 1.6160 g 硫酸铵固体,用水溶解后,转入 250 mL 容量瓶中。吸取 25.00 mL ,加过量 NaOH 蒸馏,再用 40.00 mL 0.05100 mol·L -1 的 H 2 SO 4 溶液吸收产生的 NH 3 ,剩余的 H 2 SO 4 用 17.00 mL 0.09600 mol·L -1 的 NaOH 溶液中和(返滴定)。计算试样中 NH 3 的质量分数。 [ M (NH 3 )= 17.00 g∙mol -1 ]
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皮皮学刷刷变学霸
举一反三
【单选题】When do people start to plan for the Championships?
A.
After the first snow falls in Colorado.
B.
Once they submit their applications.
C.
Before their sculptures are sketched.
D.
As soon as the judges have chosen the teams.
【单选题】When do people usually start smoking?
A.
when they are young adults (e.g., ages 20-29)
B.
when they are older teens (e.g., ages 17-19)
C.
when they are young teens (e.g., ages 13-15)