Tests for cations for IGCSE and O Level Chemistry

9 Jan 2022
*CORRECTION*
2:33 lead hydroxide is SOLUBLE in excess sodium hydroxide because lead hydroxide is amphoteric, and it further reacts with hydroxide to form a soluble complex ion.
It did not appear to be soluble in the video because there was not enough hydroxide added.
Thanks to @Vyash Brijesh and @Muwereza Nakachwa to point this out in their comments, I really appreciate it!
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In this video, I am going to show you how to perform chemical tests for the cations aluminium, ammonium, calcium, chromium(III), copper(II), iron(II), iron(III), and zinc. These cation tests are required in IGCSE and O Level Chemistry syllabi.
0:00 Source and reagents
0:35 colourless ions with a few drops of NaOH
1:28 colourless ions with excess NaOH
2:29 colourless ions with a few drops of ammonia
3:30 colourless ions with excess ammonia
4:44 coloured ions with a few drops of NaOH
5:54 coloured ions with excess NaOH
7:43 coloured ions with a few drops of ammonia
8:33 coloured ions with excess ammonia
10:03 ammonium ion
#metal #ion #cation #identification #test #experiment #practical #Chemistry #IGCSE #Olevel #aluminium #ammonium #calcium #chromium(III) #copper(II) #iron(II) #iron(III) #zinc

[@igitsali9747]

i am soo thankful this really made it easier to understand. the amount of effort it mustve taken to do this wouldve been immense i am truly thankful

[@korilakkumasoverture3338]

Thank you so much for this video! Very helpful for visual demonstration, & it makes studying and understanding this easier! 😊💕

[@Sanji_Dyez]

thanks a bunch :)

[@efuanketsiaa]

Thank you so much. You are doing a great job 👏 👍

[@FalconEye2015]

Thank you so much, helps in my 9701 paper 3

[@Skylarkraven]

Amazing work! Thank you so much. These Qualitative Analysis videos are a lifesaver for our students who are currently learning Remotely...

[@theaplussquad]

Let me know what other experiments you would like to be made available to help them learn.

[@studentdiaries101]

Nice video 👍

[@betty_success2006]

Very helpful

[@tojiKilla]

Thank you

[@bedtime1363]

I'm getting that A* soon Ms Lina!

[@thantseknyein]

I don't understand when you put NaOH in Al+ and Ca+, why does a reaction happens? Al and Ca are lower in reactivity series than Na. I'm sorry in advance if I'm being so dumb.

[@faizasohail9744]

Please tell name of salts of aluminum sodium and calcium you used in reaction

[@theaplussquad]

I used all nitrates.

[@tawakalahmed3883]

Lead hydroxide is amphoteric I think, it should dissolved in excess Sodium hydroxide

[@theaplussquad]

Yes, you are correct. I have written about this in the video description. Thank you!

[@chemlo]

Poor results. Use conc NaOH or NH3