More ... Qualitative Analysis
Yoz all,
Hope you are enjoying your hols. I'm sure you have completed your task assigned by Mr Clow Snide right?! If not, you will be banished to his Kingdom (where huh??) when I see you next week... *evil grin*
Anyway, I'm going to start a new discussion about QA.
From our lessons, we have learnt to identify H+, NH4+ and some metal cations based on their reactions with carbonate, zinc, litmus paper, alkalis and lead(II) nitrate. (Can still remember which test is for which ions??!)
If all these tests fail to give us any positive results, then we may conclude that "Group I metal ions may be present". I've told you that the flame test could actually be used to identify the metal ion present.
So here's a link for you to read about flame test:
http://chemistry.about.com/library/weekly/aa110401a.htm
The article states that "the flame test is limited by interference from other brighter colors and by ambiguities where certain different metals cause the same flame color".
Now, my question is: Can we use flame test to positively identify the metal ions? If so how? What is the principle behind this technique?
Let's discuss using the comments function. The one who contributes most to this discussion will get ..........
Picture taken from http://elementy.ru/trefil/36
The picture shows flames of three burning substances, each containing the elements sodium, strontium and boron (from left to right) respectively.
Hope you are enjoying your hols. I'm sure you have completed your task assigned by Mr Clow Snide right?! If not, you will be banished to his Kingdom (where huh??) when I see you next week... *evil grin*
Anyway, I'm going to start a new discussion about QA.
From our lessons, we have learnt to identify H+, NH4+ and some metal cations based on their reactions with carbonate, zinc, litmus paper, alkalis and lead(II) nitrate. (Can still remember which test is for which ions??!)
If all these tests fail to give us any positive results, then we may conclude that "Group I metal ions may be present". I've told you that the flame test could actually be used to identify the metal ion present.
So here's a link for you to read about flame test:
http://chemistry.about.com/library/weekly/aa110401a.htm
The article states that "the flame test is limited by interference from other brighter colors and by ambiguities where certain different metals cause the same flame color".
Now, my question is: Can we use flame test to positively identify the metal ions? If so how? What is the principle behind this technique?
Let's discuss using the comments function. The one who contributes most to this discussion will get ..........
Picture taken from http://elementy.ru/trefil/36
The picture shows flames of three burning substances, each containing the elements sodium, strontium and boron (from left to right) respectively.
posted by Potassium Hydroxide | 8:59 PM
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13 comments
