题干

在用稀盐酸和氢氧化钡溶液进行中和反应实验时,反应过程中溶液酸碱度变化及相关数据如图所示。


(1)根据此变化曲线,你认为实验操作是将什么滴加到另一种溶液中;
(2)当加入溶液的质量是a克时,滴入无色酚酞试液,溶液呈什么色,此时溶液中溶质是?(写化学式);
(3) 求恰好完全反应时溶液中溶质的质量(需写出计算过程)

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答案(点此获取答案解析)

解:设恰好完全反应时溶质的质量为XBa(OH)2+2HCl======BaCl2+2H2O73 20820g×7.3% xx=4.16g答:恰好完全反应时溶质质量为4.16g(1)稀盐酸或HCl(2)红| Ba(OH)2和BaCl2(3) 4.16g

同类题4

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    More than anything else in the world, Lion liked being King of the jungle.  He walked around, showing off his power and pride.

    Each day Lion took a long lazy sleep under the shade of his favorite tree.  He always dreamed of weaker animals bowing(鞠躬) before him.

    One day Mouse ran through the jungle and tripped over Lion's huge paws.  Lion woke up with a start. “How dare you wake me up!” he shouted angrily. Lion grabbed(抓住) Mouse with one paw. “On the second thought, I'm in the mood for the snack, and you'll make a delicious meal.” he said.

    Mouse cried out, “King Lion, please spare(饶恕) me! If you let me live, I'll always remember your kindness.  And, some day, I might be able to help you.”

    “How could such a powerless little mouse ever help me?” That thought made Lion laugh so much that he decided to let Mouse go.  A week later, Lion was walking through the jungle on the way to his favorite tree when he stepped onto a hunter's net.  The net scooped him up. No matter how he twisted (扭动) and turned, he couldn't escape.

    When Mouse heard Lion's frightened shouts, he raced to help. Mouse quickly chewed(咬)through the ropes to make a hole in the net.  Soon, Lion moved out and was free. Lion looked down at the little mouse. “Thank you for saving my life,” said Lion, smiling his widest smile.  “I was mistaken.  You are not a powerless little mouse. You are a great friend!”