题目

Here is your best chance to travel around the UK in 2012:More than 200 B&Bs (bed & breakfast) across England, Scotland, Wales and Northern Ireland are selected to offer you amazing services for your stay at their lowest prices! Don’t miss it. Just collect the vouchers(活动券)in our B&B Daily printed from 01/04/2012 to 07/04/2012 and book the stays for your travel following the terms and conditions below: ●The offer includes a room for the night and a breakfast the next morning. ●The offer is of two kinds: ￡20 per room, per night, valid(有效的)during stay period9．某化学课外小组为测定空气中CO2的含量，进行了如下实验：（1）配制0.100 0mol•L-1和0.010 00mol•L-1的标准盐酸．（2）用0.100 0mol•L-1的标准盐酸滴定未知浓度的Ba（OH）2溶液10.00mL，结果用去盐酸19.60mL．（3）用测定的Ba（OH）2溶液吸收定量空气的CO2．取Ba（OH）2溶液10.00mL，放入100mL容量瓶里，加水至刻度线．取出稀释后的溶液放入密闭容器内，并通入10L标准状况下的空气，振荡，这时生成沉淀．（4）过滤上述所得浊液．（5）取滤液20.00mL，用0.010 00mol•L-1的盐酸滴定，用去盐酸34.80mL．请回答下列问题：①配制标准盐酸时，需用下列哪些仪器BDEFG；A．托盘天平B．容量瓶C．酸式滴定管D．量筒E．烧杯F．胶头滴管G．玻璃棒②滴定操作中，左手控制活塞，右手摇动锥形瓶，眼睛注视锥形瓶内溶液颜色的变化．③Ba（OH）2溶液的物质的量浓度是0.0980 mol/L；④过滤所得浊液的目的是分离出BaCO3，防止盐酸与BaCO3反应；⑤此空气样品中含CO2的体积分数为0.025%．