A student carried out some tests on a compound X which is a white solid.The result obtained were summarized in the following flow diagram:
SolidX----(test 1)(flame test)-----> purple flame
----(test2..adding dilute hydrochloric acid)---->effervescence occured
我想問-"
係test2 果度*係咪只可以得出佢係 potassium 既compound?"
唔可以話佢有碳酸鹽?"
同埋我想問'
根據test1...個sample應該係potassium...
咁+左dilute hydrochloric acid唔係應該 有explosive reaction既咩?"
我唔係好明...
唔該哂*
幾個chem既問題"thxz!
2007-09-30 6:16 am
回答 (2)
2007-09-30 7:01 pm
✔ 最佳答案
test 1 = Demonstrate the compound contains potassium iontest 2 = Demonstrate the compound contains carbonic ion or hydrogencarbonic ion.
1. CO3 -2 + 2H+ -> CO2 + H2O
2. HCO3- + H+ -> CO2 + H2O
1. 第二個測試得出這是碳酸鹽或碳酸氫鹽
2. 第一個測試證時該化合品是鉀元素或鉀鹽，但題目說出這是白色固體，即說出 X 是
鉀的化合物。由於這是鉀鹽，並非鉀元素，與稀氫氯酸的反應並不會爆炸。
2007-09-30 6:44 am
test 1 = potassium salt only
reason: flame test, carboante ion = -ve flame test result
test 2: DILUTE HCl and carbonate ions are not that not that reactive to be explosive
** effervescence ==> carboante ion OR bicarbonate ion
reason: flame test, carboante ion = -ve flame test result
test 2: DILUTE HCl and carbonate ions are not that not that reactive to be explosive
** effervescence ==> carboante ion OR bicarbonate ion
收錄日期: 2021-04-23 22:04:04
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070929000051KK05289