题干

某化学小组模拟“侯氏制碱法”,以NaCl、NH3、CO2和水等为原料以及如图1所示装置制取NaHCO3,反应的化学方程式为NH3+CO2+H2O+NaCl═NaHCO3↓+NH4Cl.然后再将NaHCO3制成Na2CO3


(1)装置乙的作用是____ .为防止污染空气,尾气中含有的____ 需要进行吸收处理.

(2)由装置丙中产生的NaHCO3制取Na2CO3时,需要进行的实验操作有________ 、____ .NaHCO3转化为Na2CO3的化学方程式为 ____ .

(3)若在(2)中灼烧的时间较短,NaHCO3将分解不完全,该小组对一份加热了t1 min的NaHCO3样品的组成进行了以下探究.取加热了t1 min的NaHCO3样品29.6g完全溶于水制成溶液,然后向此溶液中缓慢地滴加稀盐酸,并不断搅拌.随着盐酸的加入,溶液中有关离子的物质的量的变化如图2所示.则曲线c对应的溶液中的离子是____ (填离子符号);该样品中NaHCO3和Na2CO3的物质的量之比是____ .

(4)若取21.0g NaHCO3固体,加热了t2 min后,剩余固体的质量为l4.8g.如果把此剩余固体全部加入到200mL 2mol•L1的盐酸中则充分反应后溶液中H+的物质的量浓度为 ____ (设溶液体积变化忽略不计).

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答案(点此获取答案解析)

\u9664\u53bb\u4e8c\u6c27\u5316\u78b3\u4e2d\u7684\u6c2f\u5316\u6c22\u6c14\u4f53,\u6c28\u6c14,\u8fc7\u6ee4,\u6d17\u6da4,\u707c\u70e7,2NaHCO3=\u25b3

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    LUKLA, Nepal(Xinhua) – Qomolangma, known as Mount Everest in the West, once negatively recognized as the “world's highest junkyard”, is set to become cleaner as 30,000 porters(搬运工)have been mobilized(动员)for waste collection and disposal from the mountain's southern side. The cleanup drive was launched recently near Lukla airport, one of the world's most dangerous airports yet a vital gateway to the world's highest peak.

    “Our major task is to keep Everest, which is the pride of the world, clean. This campaign aims to transport 100 tons of nonburnable garbage from the Everest region to Kathmandu in 2018,”Ang Dorje Sherpa, chairman of the Sagarmatha Pollution Control Committee said.

    The SPCC, an environmental conversation organization, has made it mandatory(强制性)since 2013 that every climber should carry down 8 kilograms of trash, but for trekkers(旅行者)there is no such regulation. Due to this, more than 100 tons of waste gets collected in the region annually.

    According to Nepalese government statistics, nearly 50,000 domestic and foreign trekkers visit the Qomolangma region annually, while more than 400 mountaineers attempt to scale the peak. The collected waste mostly includes empty beer bottles and cans, oxygen bottles, torn tents and sleeping bags, food bins, and discarded mountaineering and trekking equipment. The trash was collected by local groups in more than a dozen villages while the waste was transported down the mountain in sacks(麻布袋)by porters and yak-hybrid animals as zopkyos. The cleanup covered settlements from up to 5,000 meters near the base camp, to Lukla airport located at an altitude of 2,805 meters.

    On the first day of the campaign, several tons of waste was sent off to Kathmando from Lulka on planes belonging to Tara Airlines, one of the leading private airlines in Nepal. The airlines have set an ambitious target of flying out 100 tons of waste from the region in 2018, as a part of its commitment to the UN Sustainable Development Goals against climate change. The company's CEO Umesh Chandra Rai said: “We hope that this campaign will help the local people to maintain a pristine(原始的), natural and unspoiled environment so that more trekkers will come from everywhere, making the trekking industry here more sustainable.”