Chemistry | Stoichiometry | How to calculate percentage purity

In this lesson, you will learn how to calculate the percentage purity in Chemistry. The steps are logical and easy to follow. This lesson is relevant Grade 11, Grade 12 (NSC and IEB) and First Year University Chemistry.
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[@tshegofatsovictoria7175]

Thank you so much for the lesson. I've been battling with this since grade 10 but now I actually understand it. Thanks for adding 8 marks to my chemistry paper😭❤

[@MlungisiNkosi]

You're welcome 😊

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[@moneuamber5948]

Can you please do more videos on chemistry (percentage yield , purity , empirical formulae etc)

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[@ntokozomokwane1329]

On 8:35 when you said “This is the total mass.that mass that they gave me, that’s a total Mass.” & I nodded yhoo!!yes it is but also realized my head is on Mess Not mass.That’s when i knew i needed to take a break😂. Thank you for your efforts Sir🙏🏾

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[@siyabongankosi6761]

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[@MlungisiNkosi]

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[@MlungisiNkosi]

I’m glad you found it

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[@alphasaffi9230]

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[@lulekolebo3236]

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[@MlungisiNkosi]

Thank you

[@user-xv9et8ow1j]

Uncle I have a question to why didnt you multiply the molar mass of aluminum by2 (n=m/M , 0.2=m/2(27) because aluminum is like this 2Al ?

[@MarkChegema-yt7nh]

This is a very helpful video.Thankyou so much

[@MlungisiNkosi]

My pleasure 😊

[@promiseramapuputla2562]

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[@MlungisiNkosi]

Thank you so much

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[@MlungisiNkosi]

Thank you and welcome to the family. The organic chemistry tutor is good as well. Don't drop him if he can help on certain aspects of the content. Let's all be one big team

[@noobsarepros6136]

@@MlungisiNkosi I'll take that advice sir ,I won't drop him

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[@Cest_La_Vie]

True

[@nmx333]

Thank you sir , very helpful

[@MlungisiNkosi]

You're welcome

[@thomasramagoma5953]

❤

[@ramusiantodeni8377]

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[@MlungisiNkosi]

You’re too kind. Thank you

[@Lilshorty1.0]

Thanks

[@brunofernandes9347]

Noiceee!!!!!

[@MlungisiNkosi]

😎

[@ndumisoskhosana1664]

Please show us the other method. Thank you for the video!

[@MlungisiNkosi]

You’re welcome

[@Lilshorty1.0]

Thanking

[@AyabongaDuma]

Thank you!

[@MlungisiNkosi]

You're welcome!

[@manirambonapatrick5566]

Thank you so much Sir

[@MlungisiNkosi]

It is my greatest pleasure to serve you with good content 🤗❤️

[@LesegoMabethiwa]

sir can you please do grade 10. ❤

[@st00zy_91]

good day sir when you were calculating the molar mass for aluminium aren't we supposed to also include the coeficient in the calculations?

[@MlungisiNkosi]

No… Only when you’re using ratio and proportion do we use it

[@mandytibane2068]

Sir for 10:08 why did we not use n=m÷M for the mole because we had 8g of aluminum.... Because if we said n=m÷M it was going to be n=8÷27(aluminum) and our n was still going to be 0.296=0.3

[@MlungisiNkosi]

Remember what the challenge was... The amount given is impure. Meaning not all of the 8g is composed of Aluminum. It would therefore be incorrect to use it as though it was.

[@kgaugeloclementine9562]

Sir can you please do a video on acids and base that contains three reactions and how to reverse them

[@MlungisiNkosi]

Hello Kgaugelo... Which three reactions? May you please. Did you have a look at the acids and Bases Playlist?

[@kgaugeloclementine9562]

@@MlungisiNkosi you haven't done it yet sir We wrote a test recently and I was wondering if I could get your help

[@MlungisiNkosi]

@@kgaugeloclementine9562 I'm not sure which reactions you're referring to... Please help me understand 🙏🏾

[@kgaugeloclementine9562]

@@MlungisiNkosi if I can just get your email address so I can send it through sir

[@MlungisiNkosi]

@@kgaugeloclementine9562 [e-mail]

[@InamSangeni]

Sorry sir you did a mistake on Allumini. ...You.suppose to multiply by to. The mollar mass

[@EdgarMusonda-rr1lc]

yh i also think so😅

[@myyoutube5534]

Hi so than sir when do we actually use the coefficients of the equation in calculations?

[@myyoutube5534]

Other than the ratios

[@MlungisiNkosi]

Coefficient are the ratios

[@Avheanindou4456]

Hi sir can yoj please do a video on electrodynamics

[@MlungisiNkosi]

Oh yes.... Keep your eyes peeled. Hit that bell button

[@Avheanindou4456]

@@MlungisiNkosi done . Thank you

[@luna_jay]

How would u calculate the impure mass?? If u were given the pure mass.

[@MlungisiNkosi]

There wouldn’t be impurities in that case

[@rehauhetswesothoane1160]

Mlungisi my dhiye!!!! I’m going to buy you a new car uyava?🤭🤭🤭

[@MlungisiNkosi]

Thank you 🤩

[@yaseenabdou6831]

Hi sir ,so the mass they give us , we should not use it ?

[@MlungisiNkosi]

Yes, correct... That mass is impure. You only use it to calculate the percentage at the end

[@uncracked2302]

Isn't %purity = mass concentration of *impure* Al/mass concentration of pure Al, not the other way around?

[@MlungisiNkosi]

Nope!!!

[@willyzilly]

An hour before my final chemistry exam😂😂

[@ricardochilima8644]

How is the rewrite going for you bruv?

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@@ricardochilima8644 i passed and i did not apply for a rewrite. If you applied for one I wish you all the best munchkin

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Same

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@@ricardochilima8644 i am currrently at a private university fully funded bursary(not bragging) with a level 4 in maths and physics and i did not apply for a remark

[@oneyy6165]

Hello sir,when we calculate the molar mass we don't consider the ratios?

[@MlungisiNkosi]

Not at all...

[@oneyy6165]

@@MlungisiNkosi thank you sir😁

[@MlungisiNkosi]

@@oneyy6165 you're welcome

[@ncediwegoodnessnosenga6137]

Thak you Bu Im suffer for whatapp number

[@williammotsoare2762]

Thank you so much sir

[@MlungisiNkosi]

You're most welcome