My voice-over at the end doesn't correspond with the pictures - sorry. Ignore the voice-over and just look at the text below each diagram. The text is correct.
00:00 In this video you're going to discover more about strong and weak acids and what makes them this way? 00:20 The word acid comes from the Latin word ‘acere’ meaning sour and you may have eaten some of them today 00:27 Lemons contain citric acid and makes the flavor. Of others seem less acidic, tea contains tannic acid, vinegar ethanoic or acetic acid, and fizzy drinks carbonic acid. 00:39 In contrast, strong acids are often used in school science labs for experimentation, but they have important uses in industry. 00:48 The everyday world sulfuric acid for example is found in car batteries, but industry uses 200 million tons annually for the chemical industry 00:58 Hydrochloric acid found in your stomach, and nitric acid are also examples of strong acids 01:05 We have established in our video what makes something acidic. 0:10 The acids react with water to produce hydrogen ions, or more strictly speaking, hydroxonium ions. 01:15 Strong acids, like the three mentioned above, dissociate 100 percent into their ions like this. 01:24 Most acids are weak and remain largely as molecules in solution i.e. they do not ionize very much 01:31 Note the equilibrium arrow here. 01:35 Acids can be identified by using full range indicator from 0 to 7 on the pH scale. 01:42 pH is a measure of the concentration of hydrogen ions. 01:47 For example at pH zero, there is one mole of hydrogen ions per liter. 01:50 At pH 1, just one tenth of a mole of hydrogen ions per liter. 01:56 Each increase of one unit of pH is a tenfold reduction in hydrogen ion concentration. 02:03 So when you reach pH 7, there are only 107 or 0.0000001 mole of hydrogen ions per liter Here there are also an equal number of hydroxide ions, and we have arrived at pure neutral water. 02:24 If you dissolve one mole of a strong acid, like HCl, in water to make one liter of solution it dissociates completely into ions. So you also get one mole of hydrogen ions per liter and a pH of zero. 02:39 To get a solution of, for example, pH 4, you need to dilute this with 10,000 times its volume of water. We still have a strong acid, but it is very dilute 02:52 However, if you dissolve one mole of a weak acid, like ethanoic acid also called acetic acid, to make one liter of solution, it remains mostly undissociated molecules. That's why it smells. The molecules can easily move into the air. 03:09 Let's say the acid is only 0.01 percent dissociated so only one molecule in 10000 are split into ions. 03:18 Although the concentration of the acid is 1 mole per liter, the concentration of hydrogen ions is only 0.0001 moles per liter, that is 104, making the pH 4. Here is an example of a fairly concentrated acid which is weak. 03:39 Here are two common weak acids vinegar and carbonic acid. Vinegar is also known as acetic acid or ethanoic acid. Ethanoic acid reacts with water to produce hydroxonium ions and ethanoate ions 03:57 Strong acids however are totally dissociated into their ions, which is indicated by the non-reversible arrow in the example shown for hydrochloric acid and water. 04:08 Little test to summarize: Here are the four pictures that you saw earlier of some acids dissolved in water. Can you say which two show concentrated solutions and which two show dilute solutions, and can you say which two represent a strong acid and which two represent a weak acid? 04:27 Pause and think… 04:31 The answer is wrong
Thus makes absolutely no sense. Giving examples only shows for those particular molecules it doesn't explain how to tell any properties about the molecules. Also when you have the test in the middle of video, do you say it is dilute and weak, the text in the video says dilute and strong. I am more confused on this topic than before
![ประสบการณ์ จ้าง Developer ที่ผมจะไม่มีวันลืม [ภาค1]](http://i.ytimg.com/vi/bzivN4KDg-k/mqdefault.jpg)
My voice-over at the end doesn't correspond with the pictures - sorry. Ignore the voice-over and just look at the text below each diagram. The text is correct.
00:00
In this video you're going to discover more about strong and weak acids and what makes them this way?
00:20
The word acid comes from the Latin word ‘acere’ meaning sour and you may have eaten some of them today
00:27
Lemons contain citric acid and makes the flavor. Of others seem less acidic, tea contains tannic acid, vinegar ethanoic or acetic acid, and fizzy drinks carbonic acid.
00:39
In contrast, strong acids are often used in school science labs for experimentation, but they have important uses in industry.
00:48
The everyday world sulfuric acid for example is found in car batteries, but industry uses 200 million tons annually for the chemical industry
00:58
Hydrochloric acid found in your stomach, and nitric acid are also examples of strong acids
01:05
We have established in our video what makes something acidic.
0:10
The acids react with water to produce hydrogen ions, or more strictly speaking, hydroxonium ions.
01:15
Strong acids, like the three mentioned above, dissociate 100 percent into their ions like this.
01:24
Most acids are weak and remain largely as molecules in solution i.e. they do not ionize very much
01:31
Note the equilibrium arrow here.
01:35
Acids can be identified by using full range indicator from 0 to 7 on the pH scale.
01:42
pH is a measure of the concentration of hydrogen ions.
01:47
For example at pH zero, there is one mole of hydrogen ions per liter.
01:50
At pH 1, just one tenth of a mole of hydrogen ions per liter.
01:56
Each increase of one unit of pH is a tenfold reduction in hydrogen ion concentration.
02:03
So when you reach pH 7, there are only 107 or 0.0000001 mole of hydrogen ions per liter Here there are also an equal number of hydroxide ions, and we have arrived at pure neutral water.
02:24
If you dissolve one mole of a strong acid, like HCl, in water to make one liter of solution it dissociates completely into ions. So you also get one mole of hydrogen ions per liter and a pH of zero.
02:39
To get a solution of, for example, pH 4, you need to dilute this with 10,000 times its volume of water. We still have a strong acid, but it is very dilute
02:52
However, if you dissolve one mole of a weak acid, like ethanoic acid also called acetic acid, to make one liter of solution, it remains mostly undissociated molecules. That's why it smells. The molecules can easily move into the air.
03:09
Let's say the acid is only 0.01 percent dissociated so only one molecule in 10000 are split into ions.
03:18
Although the concentration of the acid is 1 mole per liter, the concentration of hydrogen ions is only 0.0001 moles per liter, that is 104, making the pH 4. Here is an example of a fairly concentrated acid which is weak.
03:39
Here are two common weak acids vinegar and carbonic acid. Vinegar is also known as acetic acid or ethanoic acid. Ethanoic acid reacts with water to produce hydroxonium ions and ethanoate ions
03:57
Strong acids however are totally dissociated into their ions, which is indicated by the non-reversible arrow in the example shown for hydrochloric acid and water.
04:08
Little test to summarize: Here are the four pictures that you saw earlier of some acids dissolved in water. Can you say which two show concentrated solutions and which two show dilute solutions, and can you say which two represent a strong acid and which two represent a weak acid?
04:27
Pause and think…
04:31
The answer is wrong
nice vid, but the test in the end had the names and answers mixed up
YYTUJ Y YUDT YUTUY UYT Y TY YY
i'm here because of quarantine online classes 😔🤚
me to bro
we all do mate
same bruv 😔
Same 😔
Same here 🐸
For those confused by the test at the end (4:33) the correct answers are the ones written below the examples not the ones said aloud.
Had my IGCSE Chemistry exam today (Edexcel) and these videos have helped me so much! Thank you :)
Thus makes absolutely no sense. Giving examples only shows for those particular molecules it doesn't explain how to tell any properties about the molecules. Also when you have the test in the middle of video, do you say it is dilute and weak, the text in the video says dilute and strong. I am more confused on this topic than before
4:50 "diluted and weak" when its strong, but great vid
Yes - good spot. We will edit the video accordingly. Thank you.
Chris Biba hlw . I had still one confusing point... if the acid is diluted then won't it produce more H+ ions... ?
Oh lol
@@fahimabrar3367 it can't create more h+ ions because there won't be any more of the acid for the water to react with to create h3o+
@@fahimabrar3367 no since the acid is the limiting factor, no more acid to react with
The answers at the 4:36 are mixed up. Please correct it. Otherwise a great video, thanks.
Thanks for noticing!
manyyyyyyy thanks
great work❤️❤️❤️❤️❤️❤️
👌school work👌
The narative answers for the questions (4:32 to 4:50) are jumbled
You are right. Thanks for noticing!
Leo Eady 🤩
Amazing
Was going to use for a class; but, the naming of the acid samples at the end was mixed up.
Thank you for pointing that out. We are going to update the video to correct this mistake. Thanks.
I’ve found u sir
@@fuseschool The mistakes are still not corrected. It's 3 y since you said you would correct them.
Thank you!
Yaman Abuibaid yeah
Nice video just kidding I am also studing for my bright future so thanks for help
No problem 😊
Very nice work.Please make a video on Coordination Compound or About the Color of D-block element
Can you not talk in one tone for the hole five minutes it made me bord
But good content poor delivery.
u copied the other guy. wow
I’ve learnt something on TH-cam!!!!!
i love you guys
Great to hear!
foi bom a sistir este video e muito super
Thank you!
Great video but the answers to the questions at the end are wrong.
Yes, thanks for pointing it out.
plz correct the molecular structure of sulfur (time:5.04)
5:04 This video was great until the answers were mixed up and sulphuric acid was shown as H4SO2... yeah...
To be honest, I feel bad for the person who walks away from this video feeling super ready for a test lol
You are right! There's a mistake in visualising the sulphuric acid. It was supposed to be H2SO4. Thanks for pointing it out!
Hi there friends
U drew the wrong molecule for sulphuric acid
Very informative Video thanks and i love your voice :)
Some mistakes
But overall good
Thank you!
Why is H2SO3 shown as strong acid in car batteries? Can you change it to H2SO4?
4:45 You got me all screwed up and confused here! You were reading different labels than it read on the screen. Which is the real answer!?
And 4:49 the D is dilute and weak Lol! 4:31
Anyone here for online school
you deserve more
This was just a whole lot of jumbled things. Yall are better than this
relaxing voice
i dont understand a single thing
4:8
FreeScieneceLessons are better 🚫 🧢
The animations were confusing and there were lots of misinformation.
Kya bol Raha hai Bhai?? Pagan to nahi Ho Gaye??
Can you not talk in one tone for the hole five minutes it made me bord
But good content poor delivery.
tbh thats kinda rude