Chemistry | Electrochemistry | Electrolytic cell (Past Exam Question)

[@black-clown8389]

Thanks you are the only teacher i understand😊

[@MlungisiNkosi]

Thank you... Keep up the good work.

[@LeratoHlung]

Couldn’t agree more

[@asandasbusile5870]

I couldn't understand a thing in an electrolytic cell, thanks a lot Sir, your videos are very helpful.

[@MlungisiNkosi]

You’re welcome ☺️

[@EstherChiiya]

Am watching from Zambia and I find your videos really helpful

[@khetimthembu8465]

Your literally the best 🥺🥺🥺❤️

[@MlungisiNkosi]

You say so... And I'm grateful 🤗♥️

[@yellow6657]

This must be the most followed channel in a day😭👍

[@MlungisiNkosi]

We hope it is so…

[@thatothamae2314]

Your videos are extremely helpful! Keep it up 😁

[@MlungisiNkosi]

Thank you for your kind comments

[@MahirweRucie]

Good way of teaching

[@Nkosana767]

For question 9.2. The memo shows a different answer.. they show water as the one reacting

[@lancelotbuthelezi1988]

Yes true because they used concentrated NaCl ..I think sir made a mistake there

[@ntokozomahlangu396]

​@lancelotbuthelezi1988 if they say it's concentrated it means we use H20 ?

[@LihleSiwela]

Its because Na are spectator ions

[@LihleSiwela]

​@@ntokozomahlangu396no,we use it when there is Na

[@ntokozomahlangu396]

@LihleSiwela how do you notice that Na is an spectator ion?

[@diothepoet7311]

This really helped my brother, thank you so much

[@MlungisiNkosi]

You’re most welcome 🤗

[@VanisyJonathan]

Thank you sir ❤

[@khulekaninhlenyama1844]

Sorry sir as for number 9.4 ain’t half reaction for electrode A be that of Nitrate?

[@MlungisiNkosi]

Not at all... Please watch the video again to understand how I got to the answers. Or watch the entire Playlist to see how I explained the electrolytic cell

[@NoelNoah-g9b]

On 9.2 how did the memo come with the answer of water, basically what is half reaction

[@imandollie2180]

how would you know which cu half reaction to use ?

[@ammaarahmanack9640]

if you have time sir , can you please explain :D

[@MlungisiNkosi]

Will do,,, For Cu, examiners will indicate. I will explain this well in a video

[@rejoicemasuku8961]

Sir I'm a bit confused in why water wouldn't be reduced at electrode q for question9.2 because it's an electrolysis cell and water has a higher E (v) than Sodium

[@hamzahamod8606]

The memo even says water so Im not sure

[@MlungisiNkosi]

I might have made error there. Thank you for pointing it out

[@opiyoeunice9439]

When do you form equations involving hydroxides or oxygen

[@MlungisiNkosi]

I think you’re referring to the Chloro-Alkali industry. This is the electrolysis of anhydrous Sodium Chloride
And Oxygen is produced in the extraction of Aluminium.

[@letstalkgod8488]

Hi sir, which Cu do we use because it wasn't clearly stated in this video?

[@MlungisiNkosi]

The examiner has to show it somehow.... When in doubt, use Cu2+| Cu half cell

[@laniey_66]

how could you know which cu reaction to use?

[@MlungisiNkosi]

There will be an indication

[@laniey_66]

​@@MlungisiNkosi okay thanks

[@buyisanilanga5590]

Srr Mr Nkosi I am getting confused on your 9.2... the solution is concentrated and aqueous your half reaction for Q is contradicting my understanding because sodium ion is more stable than Hydrogen ion. How can sodium get discharged over hydrogen in a solution? plz help 🙏🙏

[@MlungisiNkosi]

You are absolutely correct... I tried to shy away from those details in my expla for this cell but I do provide that detail when I explain the Chloro-alkali industry... Please check out that video for more clarity.
However, you are absolutely correct in your assertion.

[@amukelaniamukelani6788]

Thank you 😊

[@MlungisiNkosi]

You’re welcome

[@princessbongiwe734]

So during purification does the colour of the electrolyte change as the impurities fall to the solution?

[@MlungisiNkosi]

No colour would occur… oxidation and reduction occur at equal rates

[@princessbongiwe734]

@@MlungisiNkosi OK tnx

[@VanisyJonathan]

❤❤

[@gunna3197]

Thank you sir 🙏💯.sir i have seen in most of previous question papers memos they hydrogen ion instead sodium .WHY

[@MlungisiNkosi]

Because there is water… I’ll explain the Chloro-Alkaline Industry

[@andries1ramakgati]

Water is the strongest oxidizing agent than sodium ion. Look at table 4b

[@mukelaboity6762]

-the only problem I have is I don't understand how do we come up with which element is gonna have a +/- (NaCl for ex.). I'm confused sir.

[@mukelaboity6762]

Sorry bout the scratch 😭

[@MlungisiNkosi]

Please go to the full lesson first

[@mukelaboity6762]

@@MlungisiNkosi yes sir

[@HanifMatker]

That 4 cell B hw will u identify which one is cathode and which one is anode what i see is just a DC charge so how will i know which one is which plss🙄

[@bongiwedlamini]

Sir, What reaction for electrolytic Cell? Exo or Endo...am lost.

[@MlungisiNkosi]

Endothermic

[@bongiwedlamini]

@@MlungisiNkosi Thanks

[@rethabilemofokeng1698]

I can't find the video anymore. On that video you said water has a higher oxidizing ability than sodium. This time you're saying sodium will undergo reduction. Why?

[@MlungisiNkosi]

I’m not sure I follow. Did you understand the gist of the lesson though?

[@rethabilemofokeng1698]

@@MlungisiNkosi Yes sir!

[@andries1ramakgati]

Water is reduced not sodium ion. Please let's correct.frombtable 4B water is the strongest oxidizing agent than sodium ion.

[@diane8949]

Is Na gaining electron or loosing electron🤔

[@nomcebotakhonashiba]

Na is always an electron donor,so its loses 1 electron since its in group 1

[@boikgafoMatheba-x8n]

Sir why do you use Cu* +e- =Cu

[@SolamXakayi-tr3rf]

Watch the intro you will understand bra

[@beatalabercensie545]

86K🥳🥳🥳🥳🥳🥳

[@MlungisiNkosi]

May you please help me get to 100K this year please

[@sinoxolosimelekane6488]

Hi sir
Yeyiphi I province lo 2018 andiboni kakuhle?

[@KP_6]

This DBE

[@lydiakgori1156]

Sir i really didnt understand well im 9.3 can u please explain another way 🙏

[@afikangubane7045]

For 9.4 for the last one sir may I please ask why (NO3) ^- is not included in the half reaction because when Cu(NO3)2 dissociates it dissociates as shown in the video(like for the first question) . Ngaze nga lost🥺💔. Please do more past papers on this section because I failed it in P2😭💔

[@MlungisiNkosi]

NO3- is a spectator ion… It doesn’t undergo any chemical change

[@afikangubane7045]

Oh😩. Thank you so much

[@tshiamo_tee.tee04]

The answer in 9.2 is incomplete we must add (aq) 💓

[@KansiimeSharon-ir3kr]

Kansiime Sharon

[@maokotokulogo866]

U r a start

[@rethabilemofokeng1698]

👍🏽✊🏽

[@SanelisiweMkaliphi]

I understand everything until I do a question paper ay it flush all away .

[@maokotokulogo866]

Star

[@miss_pres]

Don't understand a thing here💔😭

[@MlungisiNkosi]

Please start with the full content video before watching this.

[@VanisyJonathan]

I think it's because you don't like chemistry or you don't want to understand

[@LumkaDumse]

Thank you sir🎉