O-Level Chemistry | 16 | Qualitative Analysis [1/3]

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  1. Bernard Ng
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ERROR ALERT! @19:25 to 20:20 Apologies as I misread the qns.

The answer should be B: Ca2+. Since Ca2+ will give a white ppt insoluble in excess NaOH, a ppt will be seen even if the reagent is added too quickly.

Both Zn2+ and Al3+ will dissolve in excess NaOH so if added in excess too quickly, we may not see the ppt. NH4+ does not form any ppt with NaOH.

BernardNg
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Genuinely so helpful I finally understand 😭 thank you sm fr

NourBira
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I finished my chemistry paper 2 today and it went really all thanks to you. Thank you soo much. Love from Bangladesh.

chemmy
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thank you sm i have been struggling with this chapter in sch and now i understand much better

vxen
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sir you've helped me so much w all three videos on this topic, im superrr grateful to you, thankyou for giving the best explanation e v e r of one of the hardest topics in o level chem<3

zehrahminal
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Thank you so much Mr. Bernard for the help...!

_just.livia
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9:40
Just a time stamp. You explain very well sir, thank you ^_^

mansoorahmadnasir
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Sir is there an easier way of learning the table since it won’t be given in p4

lightshadernft
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Thank you so much @BernardNg, sir please do you have a video on test for cations

tolulopearibisin
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Very well explained ! I finally understand 😊🤗

tuyunambeye
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what happened on the question (17) where a student forgot to add NaOH dropwise ? You lost me there.

AJSIZA
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So why does Zn precipitate dissolve in excess NaOH, while Ca precipitate doesn't?

bonbonpony