题干

实验室中有一瓶标签破损的固态铵盐,它可能是NH4Cl、NH4NO3、NH4HCO3、(NH42SO4中的一种,请利用如图所示的溶液进行实验探究.

【提出猜想】猜想①:该铵盐是NH4Cl

猜想②:该铵盐是NH4NO3

猜想③:该铵盐是NH4HCO3

猜想④:该铵盐是(NH42SO4

【实验探究】步骤一:取少量样品放入试管中,没有嗅到强烈的氨味,加入适量水溶解得到无色液体,选用图中的____溶液滴入试管中,无气泡放出,则猜想③不成立.

步骤二:在步骤一所得的溶液中,滴加图中的Ba(NO32溶液,没有白色沉淀生成,则猜想____不成立.

步骤三:另取适量样品放入试管中,加水溶解配成溶液,滴加图中的____溶液,有白色沉淀生成,则猜想____成立.

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稀盐酸,④,硝酸银,①

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    In 1943, when I was 4, my parents moved from Coeur d'Alene, Idaho, to Fairbanks, Alaska, where adventure was never very far away.

    We arrived in the summer, just in time to enjoy the midnight sun. All that sunlight was fantastic for Mum's vegetable garden. Working in the garden at midnight tended to throw her timing off, so she didn't care much about my bedtime.

    Dad was a Railway Express agent and Mum was his clerk. That left me in a mess. I usually managed to find some trouble to get into. Once I had a little fire going in the dirt basement of a hotel. I had tried to light a barrel(桶) of paint but couldn't really get a good fire going. The smoke got pretty bad, though, and when I made my exit, a crowd and the police were there to greet me. The policemen took my matches and drove me home.

    Mum and Dad were occupied in the garden and Dad told the police to keep me, and they did! I had a tour of the prison before Mum rescued me. I hadn't turned 5 yet.

    As I entered kindergarten, the serious cold began to set in. Would it surprise you to know that I soon left part of my tongue on a metal handrail at school?

    As for Leonhard Seppala, famous as a dog sledder(驾雪橇者), I think I knew him well because I was taken for a ride with his white dog team one Sunday. At the time I didn't realize what a superstar he was, but I do remember the ride well. I was wrapped(包裹) heavily and well sheltered from the freezing and blowing weather.

    In 1950, we moved back to Coeur d'Alene, but we got one more Alaskan adventure when Leonhard invited us eight years later by paying a visit to Idaho to attend a gathering of former neighbors of Alaska.