GCSE Chemistry - Tests for Anions - Carbonate, Sulfate and Halide Ions #65

This video covers:
- How to test for carbonates by reacting with an acid and then bubbling the gas through limewater
- How to test for sulfate ion with dilute hydrochloric acid and barium chloride
- How to test for halides like chloride, bromide and iodide ions using dilute nitric acid and silver nitrate

Exam board specific info:
AQA - Separate/triple science only
IGCSE Edexcel - Everything is suitable for you course!
Edexcel - Separate/triple science only
OCR 21st Century - Separate/triple science only
OCR Gateway - Separate/triple science only

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[what_should_i_call_myself]

do a vid for cations, pls. Ur vids are soo good, and it helps my revision soo much

[akshayaravi]

Just in case if anyone was wondering @3:19 why we add nitric acid instead of hydrochloric acid while testing for halides, even though the job of both acids is to remove anions.
Hydrochloric acid contains chloride ions which is a halide, so even if the sample ur using doesn't contain halide ion we will certainly get a precipitate.

[koyel]

You have absolutely no clue how much you've contributed in helping me learn all the sciences and math. My teachers were either not teaching in an efficient way or were going too fast for me to understand. Then I looked lessons up in YouTube and found this channel. I appreciate your work so much please keep it up. I cannot thank you enough for this. You're a saviour <3

[ishbatshahrin]

00:26 carbonates
01:31 sulfates
03:01 halides

[mariyamajaz]

OH MY GOD!
You just cleared up my whole concept in 5 mins, this is smth my teacher couodnt do in 2 weeks!!
Hats of to you, GR8 VID

[skullz]

yo this helped me so much thank you so much teacher never explained the purposes of the acids and i got so confused. Appreciate the help alot

[marths]

thank you so much cognito for all the science help you've given me this year, i dont know what i wouldve done without it💛

[engysamad]

Ur videos save me a lot from hating chemistry. u are the star of all science videos. Thank you.

[ziyinglim]

Explained it way better than my teacher! I have a test this Friday and this is very helpful. Thanks 🥺💞

[doctorvelvet]

Hello thank you for this video it is really helping, when are you going to put up testing for cations? Could you please let me know:)

[aisha-uozs]

these are by far the best videos! but we need a cations video!

[ghpremixes]

you have helped me so much for revising chemistry and biology for my exams, thank you so much!

[Urmmgy]

Can you also make a video on tests for CATIONS?

[foxzy]

Just to let everyone know, if you are doing AQA you also need to know about identifying metal ions by reacting with sodium hydroxide.

Here is what you need to know acording to AQA:

Sodium hydroxide solution can be used to identify some metal ions (cations). Solutions of aluminium, calcium and magnesium ions form white precipitates when sodium hydroxide solution is added but only the aluminium hydroxide precipitate dissolves in excess sodium hydroxide solution. Solutions of copper(II), iron(II) and iron(III) ions form coloured precipitates when sodium hydroxide solution is added. Copper(II) forms a blue precipitate, iron(II) a green precipitate and iron(III) a brown precipitate.

[Ozred]

Your videos are really helpful, please make a video on tests for ammonium, Chromium and zinc (caions).

[lelouch]

POV:you’re watching all the ads to give this guy more money!
He deserves it

[WhenThingsGoWrong]

Thank you for this video. You saved my life with this.

[graceheaven]

This channel is just the thing we all needed, thank you cognito! 🎉
Also could U pls do a vedio for the test for cations as well?

Also, can anyone tell me...in the test for halide ions, in the first step of each, do we add nitric acid to each sample or is it just for chlorine?

[EnglishFishBTW]

Test for sulfates came up on the test and I think I got it correct! Thank you so much! :)

[jayhoon_supremacy]

this is rly helpful for my chem test tmr, thanku!!