Quick revision - Transition elements (complex ions)

[@yellowishh]

thank you! my exam is tomorrow and this helped me recall everything! good luck to everyone!

[@saradeaf-mh6gu]

How did it go

[@beans06682]

you are the best sir !!

[@noonecares1203]

Best teacher ever

[@MaChemGuy]

No One Cares Not sure about that but 🙏🏻

[@nejahkawaiihassen8294]

@@MaChemGuy shut up

[@yabombo8145]

@@nejahkawaiihassen8294 just tried saying your name and my furniture started floating

[@yabombo8145]

@@nejahkawaiihassen8294 how are you telling hard working men to shut up over a computer screen

[@isabdel3975]

@@nejahkawaiihassen8294 ws wrong w u

[@abdulwahabmangat2651]

Even your videos are quite helpful in CAIE a levels chem

[@asif7240]

This is amazing! Thank you so much

[@K1LL3Rrz]

heterohenous and homogenous catalysts video ? ;c

[@tanishaahmed8601]

Thanks for the video!!! Do we need to know the names for the shapes of the complex ions. such as hexaaquairon

[@MaChemGuy]

I always teach the names. Not being an examiner I wouldn’t like to say you do or you don’t

[@katygardiner2558]

On the cis square planar complex ions does it matter if the two ligands that are the same are bonded next to each other on the sides or can they be bonded next to each other at the bottom?

[@MaChemGuy]

Kit kat Just need to be 90 degrees apart 😀

[@katygardiner2558]

MaChemGuy thank you! Your videos are the best!

[@MaChemGuy]

Kit kat Aw thanks! Good luck!!

[@h.y.8063]

@MaChemGuy Hi sir i have an urgent question before my exam on tuesday, on the OCR textbook, sometimes the Cr3+ ion is referred as a violet colour when reacting with NaOH but on other occasions it is green, which one should be the correct one? Thanks very much!

[@MaChemGuy]

Bellamyyy369 yo Have you seen this one? kzbin.info/www/bejne/nV6YmWh6a8tog8k

[@h.y.8063]

@MaChemGuy yes sir I did, but it seems like u didn’t talk about why sometimes it’s purple and sometimes it’s green, cuz Cr3+ can be green right for example after heating under reflux with Cr2O7^2-/H+ for aldehyde..... and I am really confused about this :((( ... thanks very much for all the amazing videos by the way

[@mooodlemip4779]

@@h.y.8063 its purple(aq) when in just water, grey green(s) when in a slightly alkaline solution, and dark green(aq) when in a very alkaline solution OR when one of its 6 water molecules is replaced by a sulfate ion. Often sulfate ions are present in the reaction to form aldehydes, so these react with the Cr3+ to form a green solution. You don't need to know about that for the exam but I think its useful cos otherwise its just confusing. I found this info on chemguide which is a really useful website for filling in some of the information holes left by the exam board.

[@p.p6343]

Do we need to memorise a few examples of octahedral and tetrahedral complexes? ty!

[@mooodlemip4779]

wont tetrahedral complexes with 4 different ligands form optical isomers too???

[@MaChemGuy]

Suppose so, just never came across one

[@valeriemoore1437]

This is great, but I never remember why it’s octahedral even though it has 6 Ligands, could you explain that please

[@MaChemGuy]

Valerie Moore Glad you like it! The 3D shape has 8 faces hence an octahedron 😊

[@valeriemoore1437]

MaChemGuy oh okay and by faces do you mean the ligand arrangement? How do other complex ions with 6 ligands form non octahedral shapes? Sorry for it that’s confusing

[@tgdhsuk3589]

remember from as, there are 3 lines kind of like 3 planes and each of the ligand bond is a vrtex, thereveore an octahedral complex for example if you draw lines from oposite verticied of a cube theen you get square planar i think i dont know sorry lol

[@valeriemoore1437]

LegendaryVegeta oh so it’s just about the planes? Nah I get what you mean thanks

[@saumya2004]

Sir can you please link this ppt in the description box?

[@anonymous-kr9pj]

do we need to memorize these ligands

[@NehaSharms]

Hi, how do you know that the (C204) ligand is 2-? Thank you!

[@MaChemGuy]

I make my students learn this one

[@NehaSharms]

MaChemGuy thank you! Are there any more like this to remember?

[@MaChemGuy]

I'd make sure you also know that EDTA is 4- and the ethane-1,2-diamine ligand has no charge

[@NehaSharms]

Thank you!!

[@MaChemGuy]

You're welcome - good luck!!!