题干

向Ba(OH)2溶液中逐滴加入稀硫酸.请完成下列问题:

(1)写出反应的离子方程式 ____  

(2)下列三种情况下,离子方程式与(1)相同的是____ (填序号).

A.向NaHSO4溶液中,逐滴加入Ba(OH)2溶液至溶液显中性

B.向NaHSO4溶液中,逐滴加入Ba(OH)2溶液至SO42﹣恰好完全沉淀

C.向NaHSO4溶液中,逐滴加入Ba(OH)2溶液至过量

整个过程中混合溶液的导电能力(用电流强度I表示)可近似地用如图中的曲线表示是____ 填序号).

(3)若向装有Ba(OH)2溶液烧杯里缓缓滴入KAl(SO4)2溶液至Ba2+恰好完全反应.则反应的离子方程式是 ____ .

上一题 下一题 0.0难度 选择题 更新时间:2019-02-27 10:45:28

答案(点此获取答案解析)

Ba2++2OH\ufe63+2H++SO42\ufe63\u2550BaSO4\u2193+2H2O,A,C,2Ba2++4OH\ufe63+Al3++2SO42\ufe

同类题5

阅读理解

    “There's a mother in PICU(儿童重症监护病房)who wants to talk about a kit she received,” the nurse told me. “Something about it made her cry.”

    I've been a child-1ife specialist at the Cleveland Clinic Children's Hospital since 2000. I help families understand diagnoses and treatment plans and manage the ups and downs that come with caring for a sick child. Tough talks with parents are part of the job, which still makes me feel nervous.

    The kits the nurse was talking about were something I had recently introduced to the hospital: Comfort Kits from Guideposts. They were supposed to make a child's experience here easier, not upsetting.

    When I came across the kits at a conference. I fell in love with them. A treasure box of items designed not only to entertain kids, but to comfort and inspire them. There's a coloring book, a stress ball, a CD of relaxing music, a hairy star named Sparkle, a journal and much more. I really believed these kits would help kids. I wished I hadn't been mistaken.

    At the patient's room in PICU I saw a little girl, sleeping soundly, surrounded by tubes and machines. My eyes met her mother's. The kit was open on her lap and tears were running down her cheeks.

    “I'm Shannon. I manage the Child Life Department.” I said. “I'm sorry if the kit upset you .It's a new item…”

    The mother shook her head. “This has been one of the worst days of my life .I felt so scared and alone. Then I was handed this box. I know it's for my daughter, but it's just the comfort I needed. I wanted to say thank you.”

    With that I knew Comfort Kits belonged here. We've been using them for almost three years now. Each child who's admitted to the hospital receives one. Every day I see kids coloring, journaling, playing with Sparkle.

    But as this mom showed me Comfort Kits aren't just for kids. The hope they bring, which can be in short supply in hospitals sometimes, is felt by the whole family.