GCSE Chemistry Revision "Metal Hydroxide Precipitates" (Triple)

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In this video, we look at how to identify metal ions from their precipitates with sodium hydroxide solution.
This video is based on the AQA spec. If you are following a different exam board then you should check 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.
Deliberate Thought by Kevin MacLeod is licensed under a Creative Commons Attribution licence (creativecommons.org/licenses/...)
Source: incompetech.com/music/royalty-...
Artist: incompetech.com/
Image credits:
Lithium test "upload.wikimedia.org/wikipedi...
By Herge"
Sodium flame test Public Domain, commons.wikimedia.org/w/index...
Potassium flame test "upload.wikimedia.org/wikipedi...
By Herge"
Calcium Public Domain, commons.wikimedia.org/w/index...
Copper By Søren Wedel Nielsen - Own work, CC BY-SA 3.0, commons.wikimedia.org/w/index...

Опубликовано:

10 янв 2018

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Комментарии : 73

@hbarton53 5 лет назад

Watching this video out loud in the kitchen and my sister chimes in 'the man is a bit weird', everyones a critic but my dad simply replied 'i like the man' so you have fans of all ages.

@yikekanshijie Год назад

clearly it is the ai of the man that is in the video

@KingAryan911 4 месяца назад

@@yikekanshijie it was made 6 yrs ago , at ur time , prob 5, so i doubt ai was that advanced back then

@Galapheus 4 месяца назад

@@yikekanshijiekeep in mind this video was filmed 6 years ago

@joelh3466 6 лет назад

First of all can I please just say, I cannot describe how much of a help you have been sir. Is there any acronyms to remember these tests and their colours. As a small request, at the end of the videos can you please do some past exam questions to consolidate our knowledge on the topic. If you can do this, it will help so many of us to master the topics.Once again many thanks.

@harveersingh5504 6 лет назад

Damn just did this in school and my teacher explained jack shit. Thanks for making it all make sense 👍

@tasnimelaraby7676 2 года назад

THANK YOU SO MUCH MY TEST IS TOMORROW AND I HONESTLY DIDNT UNDERSTAND ANY OF THIS TILL I SAW THIS

@dhr2116 2 года назад

@destiny-powerhouse3260 6 лет назад

Should we memorise the equations for the precipitates formed for calcium, aluminium and magnesium??

@person2631 Год назад

did you need it, ik its abit late but I'm halfway through gcses I need to know if the equations are actually relevant

@juliettavekemans9733 Год назад

@@person2631 In the specification it doesn't mention the equations specifically. Only the colours are important (depending on your examboard, I believe, so I'd advice you to check yours).

@onxgains9378 2 года назад

Done w my IGCSES AND THANK YOU SOOO MUCH !

@ayorindeoluwaseun4911 4 месяца назад

Wish I had access to these videos when I was in secondary school

@rikhil_8818 6 лет назад

Do I need to know the IONIC equations and the SYMBOL equation as in the CGP guide it includes the ionic but not the symbol, which do I learn. help.

@M0Hamza9 Год назад

This guy is a legend

@MODDINGPRIME 6 лет назад

if ive only got a few days until the exam and dont know these, should i even bother spending time trying to memorise these along with all the other ion tests?

@Freesciencelessons 6 лет назад

Yes because if they come up they are very easy marks indeed.

@saalihahmahmood7883 6 лет назад

My exam is tomorrow, if I can do it you deffo can lmao

@Its_DevsterFIFA Год назад

@@saalihahmahmood7883 ik im 4 years late, but how did it go

@user-wc9wl1bv4y 6 лет назад

Thanks for the great video. Do we need to learn the colours for each copper II, iron II etc.?

@flyingscotsman7778 6 лет назад

Yup: Copper(II) forms a blue precipitate, iron(II) a green precipitate and iron(III) a brown precipitate.

@19aezrham 4 месяца назад

In the CGP chemistry book for the equations with sodium hydroxides, it doesn't make anything a nitrate so e.g. how you did it: Fe(NO3)3 +3NaOH --> 3NaNO3 + Fe(OH)3 how the book did it: Fe^3+ + 3OH^- --> Fe(OH)3 what do we need to know for the exam?

@LokmanMuhd 5 лет назад

Can anyone explain clearly why Cr(OH)3 is soluble in excess of NH3 solution???

@benclark7669 6 лет назад

Are we expected to memorize all of the equations shown in this video? It seems like a lot of work to memorize it all so id like to know if it's necessary, thanks

@Freesciencelessons 6 лет назад

The exam board says that you should be able to write balanced equations for the reactions to produce insoluble hydroxides. It's possible that they'll ask you for an equation (after seeing paper 1 I would not be surprised). Or you might have to balance one.

@gemmanewport2555 4 года назад

Hi sir, Thanks so much for all of your help!! I am just still confused at to why the ions are in the form of nitrates? Do they have to be nitrates? and do we need to be able to write ionic equations for the reactions?

@Freesciencelessons 4 года назад

We use nitrates because nitrates are always soluble. We are identifying ions in solution, so they must be soluble.

@gemmanewport2555 4 года назад

Freesciencelessons okay that makes sense, Thank You!

@petecowley3481 2 года назад

This man deserves a knighthood

@cb55555 6 лет назад

Do we need to know the balanced equations for each test?

@Freesciencelessons 6 лет назад

The spec says that you should be able to write balanced equations for the reactions to produce insoluble hydroxides. However, I don't know whether they'd expect you to know them or simply balance them. If you have time, it's worth learning in my opinion.

@cb55555 6 лет назад

Freesciencelessons ok thanks

@amiracampbell5973 6 лет назад

Do these work with only nitrates or any?

@sullygangster849 6 лет назад

Few questions... When will chemistry paper 2 be done? Which paper is next? And when will b2 and p2 be finished? Thank you!!!

@Freesciencelessons 6 лет назад

Chemistry paper 2 will be done tonight and Physics papers 2 is next. That will be finished by March and then Biology 2 will be finished by June.

@sullygangster849 6 лет назад

Freesciencelessons thanks but isnt june abit late as our exams actually start in may...

@Freesciencelessons 6 лет назад

All of the videos for the May exam were finished months ago.

@Freesciencelessons 6 лет назад

All of the videos will be done in time for the exams (with plenty of time to spare).

@crazyratlady1738 4 года назад

Thank you for all your work sir I really appreciate it, you are a hero.

@elsacarlssson 4 года назад

king

@yazmocha 4 месяца назад

Are we meant to memorise the equations? Or will we be given them to balance in the exams?

@thooey9444 2 месяца назад

well if you understand that this reacts with that then u'll know how to form an equation, just know how to form the compounds into molecular formulas, but if not then its fine to just memorise them i think!

@user-xs5yk2ex2g 4 месяца назад

Could someone please give me a method to write on my flashcards? Thank you

@xxxxx2848 6 лет назад

Is his in the edexcel syllabus?

@safaakadiri7142 6 лет назад

no, its aqa

@humzashah4932 5 лет назад

at 1:27, sodium has displaced calcium because it is more reactive right?

@Freesciencelessons 5 лет назад

No the hydroxide ions form an insoluble precipitate with the calcium ions.

@humzashah4932 5 лет назад

@@Freesciencelessons oh, thanks a lot for the clarification mate, or shall i say sir

@anonymousog9608 6 лет назад

In the exam, if this topic was to come up, would the reaction DEFINITELY be with a nitrate?

@sugasalt5843 6 лет назад

No he said it could be with any soluble compound so not necessarily nitrate but the reaction is the same regardless what compound the metals are in.

@sallymetcalfe8175 5 лет назад

night before exam anyone?

@user-qx2dq2lb2u Год назад

Professor 🫡

@footballmaster9539 6 лет назад

First like

@khattakjarir3399 2 года назад

how does the copper displace sodium if it sless reactive

@Freesciencelessons 2 года назад

The copper does not displace the sodium. In sodium hydroxide, both ions (the Na+ and OH- ions) are in solution. The copper ion forms an insoluble compound with the hydroxide ion and precipitates out of solution.