GCSE Chemistry Revision "Strong and Weak Acids"

For thousands of questions and detailed answers, check out our GCSE workbooks www.amazon.co....
Great deals on workbooks for schools www.freescienc...
In this video, we look at strong and weak acids. We explore the difference between a strong and weak acid and how we can use the pH scale to see this. We also see what is meant by an "order of magnitude".
This video is based on the AQA spec. This video may be appropriate for iGCSE / O Level Chemistry. Please consult your specification. The Amazon link above is an affiliate link. This provides a small commission which helps to support freesciencelessons. The cost remains the same to you. If you prefer not to use this, you can search Amazon for the Freesciencelessons workbooks.

[@zamareehaidari6405]

Unreal tutorials, simple step by step explanation. Would strongly advice any Chemistry Gcse students to watch these tutorials. Thanks mate.

[@justsomeguywithoutapenis1133]

This science teacher is my G, been watching since yr 7 I'm now yr 11.

[@ayeshabibi9676]

Good luck in your GCSE’s !!!

[@gOdhazZ]

how did you do

[@chillypong4200]

Howd u do

[@the2401]

same

[@kedusdawit4015]

How did u do

[@zainahmed8577]

Because of you i got a 9 u might as well be my science teacher

[@Freesciencelessons]

Well done on that 9. They're extremely hard to get.

[@zainahmed8577]

Thank you Boss (You need to teach my teacher how to teach)

[@zainahmed8577]

:)

[@zainahmed8577]

i dont know how to revise, natural talent

[@tyrone6816]

Lew Sihan U.K.?

[@sebgrootus]

i love the smile at 4:18

[@AB-fr1sx]

I feel blessed 🤲🏽

[@bitcoin4537]

same bro!

[@melxoxo4197]

blessed to see it🤍

[@harishankarshikkulal8599]

way more subscriptions deserved for this revision material

[@user-tg1zf6ow4o]

Just got my science mocks back and thanks to you I got a 8 in biology a 9 in chemistry and 9 in physics thanks so much please never stop making these videos

[@tibi8592]

What else did u do besides watching his videos???

[@Ewok-gf7sz]

Good luck on Fridays chemistry then :)

[@clairo.9619]

@@tibi8592 I know u didn’t reply to me but I got the same grades (except an 8 in physics and 9 in biology) and I did tonsss of past paper questions and made flash cards!

[@sideman6428]

You my friend, are a fucking lifesaver. I have my mocks tomorrow and im just binge watching your videos.

[@mohammudghafoor8305]

thanks a lot I got an 7 in chemistry !

[@at3036]

good job :)

[@rakibulbhuiyan8677]

I would like if you got a 8 but well done!

[@xminterminator]

@@rakibulbhuiyan8677 I love how that guy put an 7 and you put a 8.

[@izzygeorgia1274]

Well done!

[@mathupcia1255]

Mohammud Ghafoor impressive

[@shushgucius856]

I’m almost finished gcses and this angel is saving me 8 hours before my second to last science exam. What a legend!

[@IPurpleYouALot]

do you remember what you got?

[@jolinlu7784]

A lot of thanks from two Chinese students who are both studying IGCSE! We both get A in our unit test, you are the belief that supports me to continue studying chemistry ：）

[@isctngg]

only useful things my teachers ever done is link this mans channel fr has saved me in every science possible. I take triple higher and this guy is so bless

[@Liyahyes]

REAL

[@josephnixon9271]

imagine saying year 10 will fail their gcses because of corona when he exists

[@benjames2506]

Ngl mate I’m in year 11 rn but it’s hardly easy missing 6-7 months and having exams delayed by 3 weeks regardless of who you watch or how you revise

[@youmakethewaterwarm]

@@benjames2506 true, and good luck

[@user-qg4td6rg5x]

Currently year 11 with mocks rn

[@balls1099]

@@user-qg4td6rg5x same bro

[@AdoptedPoo]

@@benjames2506 na it's pretty easy when there is a multitude of resources online, school is pointless for the most part in year 11 the only gcses that matter are sciences, maths and English.

[@kratchgaming3665]

Does this guy ever move? I could switch from 1 video to the next and not notice any difference.

[@marscort5143]

This man is a literal life-saver

[@Freesciencelessons]

Thanks, I appreciate your comment.

[@ellainad2427]

This is SO helpful! Thank-you so much for doing these!

[@armanditta2676]

When are you moving onto 9 to 1 physics

[@katherine118]

Legend, thank you for this video it was very helpful. Much more depth than a textbook.

[@Freesciencelessons]

No problem, I'm happy to help.

[@nomaanmhd3767]

Sir, the AQA Specification says that this topic/video is only for HIGHER TIER.

[@DaveSVCC]

Thank you so much. All these videos must take so long and they're so useful. Thank you

[@reemtluli1592]

Thank you sir for the amazing videos! are you planning to do any other videos for other subjects such as math because that would be AMAZING!! and can you give me any advise for gcse biology (b1,b2,b3) because i am really worried

[@willlowmusic]

Not sure if this is wrong but at 3:20 and further on, he says that a PH of 3 has 100x more H+ ions however it is a higher PH and Acids are lower PH so surely it's not?

[@willlowmusic]

Not trying to be annoying just confused

[@Freesciencelessons]

No I say that a pH of 1 has 100x the concentration of H+ than a pH of 3.

[@tvs_b333]

THANK YOU i finally understand all those random equations my teacher was yapping about

[@riri_bbk]

year 11 mocks start next week for me and my teacher rushed through this topic so now i’m left having to redo it 4 days before my chem mock… yay!!

[@Wolhellm]

Good luck for anyone doing chem tomorrow!

[@mishraman9902]

Love your videos. Have earned a subscriber.

[@daisyfin8546]

Can you do a video on infrasound and seismic waves please?

[@woodycollins737]

Hi Freesciencelessons, I was just wondering, when learning the strong acids, do we need to know the equations of them or just the names? Your videos are super helpful :)

[@Freesciencelessons]

Hi and thanks for the comment. You need to learn the name and the formula of the three acids.

[@woodycollins737]

@@Freesciencelessons Great, thank you :)

[@user-xe2vk2xe9g]

When you say strength at 3:56 do you mean the amount?

[@mushtaqrasool9169]

This is one of the most underrated channels on KZbin Whos doing some last minute revision?

[@sarah5138]

1:36 i'm having trouble understanding this is their a way to forming these equations or is it just ones we have to learn

[@Freesciencelessons]

I'd recommend learning them. Understanding them is tricky at GCSE.

[@ajayjohnmaryjohn9707]

Got a mock tmrw U r saving lives

[@castwt]

Hi sir please reply as i have my mock soon. At 1:40, why does sulfuric acid have SO4(2-)? Why is there 2- i dont understand as none of the others have that!

[@Freesciencelessons]

Sulfuric acid contains the sulfate ion SO4 2-. The 2- charge is due to the arrangement of electrons. However, you don't need to know why for GCSE. You just need to learn it.

[@MCCAKEmario]

got i mock tomorrow i wounder how it will go?

[@illizeroilli5762]

yo year 10 that are revising for mocks, what is the difference between H- and H+??

[@onetwo4052]

What reaction could you do to show the difference between weak and strong acids?

[@Freesciencelessons]

That's heading into A level Chemistry there. Have you been set this for homework?

[@onetwo4052]

Freesciencelessons no, I saw it on a past paper

[@billiejean685]

I got this question as well

[@AdoptedPoo]

@@onetwo4052 This is late but a strong acid has stronger ionising abilities (splitting hydrogens) ,e.g HCl is a strong acid as it completely splits it's Hydrogen ions, where as a Carboxylic acid is considered a weak acid as it doesn't completely split it's hydrogens ions (donate hydrogens). Acids are protons donors the stronger the acid the more protons it will donate. A proton being i H+ ion.

[@user-qg4td6rg5x]

@@AdoptedPoo donors?

[@lifeisadventurous1031]

God bless you

[@Heatherisbetterthanuu]

Because of this legend I’m actually getting higher grades especially that I’m in yr11 now

[@arakurd6351]

you don't need to learn the symbol or word equations for any of the weak acids?

[@mrtakethatrizz-y5u]

@freesciencelesson can you do a video on Musculoskeletal system please

[@harlem8764]

Hey there sir. Doing revision. Quick question. In bases, is it true that the more reactive the metal, the more it is acidic or alkaline?

[@Freesciencelessons]

No not strictly true. Don't forget that non-metal compounds are acidic. Metal compounds (oxides and hydroxides) are bases and alkalis. The alkalinity depends on how easily the compound dissociates in water. Group 1 hydroxides do dissociate very easily but that is not linked to the reactivity of the metal (it is due to the charge density of the metal ion, which is beyond GCSE).

[@harlem8764]

Freesciencelessons Ah. I see. Thanks for the tip.

[@raheemzahid8971]

What are the chemical equation for all the weak acids

[@raksheetamakhey6549]

Hey thank you soo much... Is this concept of strong and weak same for alkalis?

[@kenji1952]

Ty because of you i got top of my class and 2nd best in my year in a exam

[@MH-yt7vm]

Sir it would help if you could answer this question. At 2:41 what do you mean by a given concentration?

[@bestbuilder7833]

Its just any concentration: i.e. 1 mol/dm^3, etc

[@khaledabdallah4689]

at 2.05 shouldn't the H have a 2 in front of it and the charge on the HCO3 have a -2 charge

[@Freesciencelessons]

No because H2CO3 does not release both of its H+ ions. It normally releases one H+.

[@Rhea-study]

Hi Sir, could you please arrange the playlists so they are in order of the specification/ cgp textbooks as it would make it easier for me to follow

[@Freesciencelessons]

They are in the order of the specification.

[@Rhea-study]

Ah my bad sir I think it is my guide that is in the wrong order @@Freesciencelessons

[@Freesciencelessons]

No problem. The easiest way to find all my videos is to go to my website www.freesciencelessons.co.uk. All of the videos are listed there in the correct order.

[@yahye327]

why when the pH scale decreases the concentration of hydrogen ions increases a lot?

[@JamifyYT]

Hi sir - what is the difference between (using hydrogen on its own as an example) 2H and H2 -(a small 2) Thanks

[@Freesciencelessons]

2H is two individual atoms of hydrogen not chemically bonded (this is not very common as it's unstable). H2 is two atoms of hydrogen which have chemically bonded to form a hydrogen molecule (this is very common as it is relatively stable).

[@matthewhughes4558]

I could not find the link what is it?

[@sf_0160]

If you increase the concentration of an acid so it will have no effect on the pH?

[@taybeneett833]

Is this for higher tier only?

[@crispiermars3618]

@tay beneett, I'm pretty sure the AQA specification says it is

[@lizzardkhan4199]

This is for combined higer as well? Its in our spec

[@trustmestraight9s]

Got my GCSE’s this year I’m done for

[@sarahrutter4084]

Do we need to know the elements for the weak acids?

[@Freesciencelessons]

You should learn the names of the weak acids but not their structures.

[@jadalove9819]

Very helpful and *clear* thankyou

[@Freesciencelessons]

Thanks. I appreciate your comment.

[@rebeccamartin6939]

So is pH a measure of how strong an acid is or how concentrated it is?

[@AdoptedPoo]

How strong and how concentrated it is, because pH is the measure of how many Hydrogen ions are in an acid or alkali. So pH 1 is more concentrated than pH 6 as pH 1 is 1*10^8 times the magnitude in contrast with pH 1 which is 10* the magnitude(the lower the pH the stronger and more concentrated the acid is).

[@HB-jf6yq]

A Creme Egg You mean: PH 1 has 1x10^5 times the magnitude than PH6 right?

[@cansuozdemir6274]

Thank you SO much

[@meganlo9442]

so do all acids contain a postitive and a negative ion

[@Freesciencelessons]

All acids contain the positive ion H+ and then also a negative ion which depends on the acid.

[@4nik4]

hello sir, i don't understand this concept fully, i have a question. does the ph increase if the concentration of a acid increases regardless of the strenght?

[@Freesciencelessons]

The pH DECREASES (ie goes towards 0) if the concentration of H+ increases. This can happen with a strong acid (eg hydrochloric) or if we increase the concentration of an acid (because there will be more H+ ions in a given volume). I hope that helps.

[@DanceWithAshh]

can i buy your workbook even if im doing ocr science?

[@rikki5199]

Hi Sir, I was just wondering if this also comes up in the Combined science specification (trilogy) as this particular topic is in my combined science revision guide but you’ve specified it as triple. Thanks.

[@christinakurian2433]

When it says 'even if the strength of the acid is the same', what exactly does that mean?

[@Freesciencelessons]

It means either both a strong acid or both a weak acid.

[@yesyes8613]

Is this higher tier

[@muhammadmalik6794]

what do we mean by a "strong acid" as in is it dangerous or...

[@AdoptedPoo]

A strong acid has a low ph and therefore it can split easily (ionise), for example HCL is a strong acid and it's very easy for it to donate it's Hydrogen ION or proton.

[@mafkhry8231]

i have a question ,,, why is the ph level 1 to 2 . 10 and then 1 to 3 is 100 . isnt it supposed to be 20 instead of 100 ? explain please

[@Freesciencelessons]

Each pH unit is 10x more than the previous one. 1->2 = 10x, 1->3 = 100x.

[@sarah5138]

@@Freesciencelessons i don't understand

[@user-qg4td6rg5x]

@@sarah5138 2 to 3 is still x 10

[@Qwerty-ky4ek]

isnt the scientific term dissociation?

[@Freesciencelessons]

Yes but for AQA GCSE, it's "ionised".

[@johndutton1593]

Your the man

[@8plex440]

Thanks 👍

[@raphaeladeosun6857]

useful info amazing!!!

[@sylvr12]

its 4am, exam is at 9. Thanks to you, im saved tho

[@kevinpius1793]

is the pH scale logarithmic?

[@Freesciencelessons]

Yes it is.

[@skiski2485]

I hope I can pass my first ever mocks and if not I will keep trying thanks

[@darkcontinuumfilmproductio5249]

Mocks only happens twice :|

[@user-qg4td6rg5x]

@@darkcontinuumfilmproductio5249 mine only happen once one of them is rn

[@user-qg4td6rg5x]

@@darkcontinuumfilmproductio5249 think she means college asw

[@ScaffoldingPLAYZ_YT]

Ty

[@retrojgaminganddogs7969]

Watching this 15 minutes before the exam😭

[@goldenkite0843]

this is amazing

[@anonymousog9608]

Will a dilute version of Hydrochloric Acid have a lower pH than what it would normally have?

[@Freesciencelessons]

It has fewer hydrogen ions in a given volume that a concentrated solution.

[@user-qg4td6rg5x]

@@Freesciencelessons so is the pH the same

[@daveleong2209]

Thanks Sir

[@diyah.x]

I love these videos so much defo gonna do well in my mocks

[@jossdownes]

are you sure the molecules don't dissociate in strong acids? not ionise

[@Freesciencelessons]

Hi. For acids, the words "dissociate" and "ionise" mean the same thing.

[@arakurd6351]

@@Freesciencelessons Do you need to know the symbol equations for the weak acids. I am on edexcel so it might be different for me.

[@Flydem223]

great video

[@prathamdalwadi2959]

He should start a patreon

[@oliviaelliott1333]

Thanks!

[@ItzLouis]

i love my awwos

[@noone-vq7cu]

good luck with chemistry tomorrow guys 🦾

[@voodoocurry2762]

Finally I get it 💀

[@bitcoin4537]

LOL! YOU TALL MAN!

[@jood-or5mn]

handsome man

[@heidipyle3583]

Does anyone else point at the same time as him to something in ur room