题目

硫代硫酸钠(Na2S2O3)可用做分析试剂及鞣革还原剂。它受热、遇酸易分解。工业上可用反应:2Na2S+Na2CO3+4SO2===3Na2S2O3+CO2制得。实验室模拟该工业过程的装置如图所示。 回答下列问题: (1)b中反应的离子方程式为________________,c中试剂为________。 (2)反应开始后,c中先有浑浊产生,后又变澄清。此浑浊物是________。 (3)d中的试剂为________。 (4)实验中要控制SO2生成速率,可以采取的措施有______________________________________(写出两条)。 (5)为了保证硫代硫酸钠的产每个学校都有校规,请根据下面表格中的内容,完成短文。(要求所给提示都用上,并注意所给短语的适当形式)Allowed1.bring drinks to school2.do sports on the playgroundNot allowed3. bring mobile phones to school4. run in the hallway5. get the ears piercedStudents in my school are not allowed to 【1】 because some students can use them to play games or send messages. But we can 【2】. We are not allowed to 【3】 because it is dangerous. But we can 【4】 after class. Coming to school late and【5】 are not allowed, either. Though we have so many rules, we love our school.
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