题干

有一包粉末,可能由氯化银、碳酸钠、氢氧化镁、氯化钡、硫酸钠和硝酸钾中的某几种组成.为了鉴定其成分,实验如下:

①将少量粉末放入足量水中,搅拌、静置、过滤、得白色沉淀和无色滤液.

②向所得沉淀中加入足量稀硝酸,沉淀全部溶解,但无气体产生.

③向滤液中滴加硝酸银溶液,有白色沉淀生成,加入足量稀硝酸,沉淀不溶解.

试根据以上现象推断该白色粉末中一定含有____;一定没有____;可能含有____.

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氢氧化镁、氯化钡,氯化银、碳酸钠、硫酸钠,硝酸钾

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                                                                                     Guided Walking Week April 2016

          Dates: April 30th-May 7th 2016

          Location: Abdet, Costa Blanca

         A week of guided walking in the mountains around Abdet. Highlights include the climbing of Valencia's highest summit (Sierra de Aitana), traveling completely around the impressive Puig Campana, and several explorations in the Sierra de Aitana. Ancient trails lead through spectacular canyons(峡谷) to abandoned settlements situated high in the mountains. You will discover the snow trader routes which lead from the incredible snow holes high in the mountains down to the villages and towns on the coast. These years, golden eagles have made a return to this area, and you may also see other animals—wild goats, foxes, wild pigs and red squirrels.

         As part of the week you are invited to help clear some local walking paths. This involves clearing collapsed walls and rocks, cutting back fallen trees. This is of course optional and is just for half a day, it's actually great fun!

Price:$499

Includes:

  Accommodation in the beautiful mountain village of Abdet

  All food-good home cooking

  Beer, wine, soft drinks

  Snacks and post walk treats

  Packed lunches & drinks(except café/bar visits)

  Expert guiding

  Photos/Videos of your days in the mountains

  Airport pick-up/return $25 each way(fly to Alicante)

  Single room supplement $75

  To book or get further information, please contact info@abdet. com.