Acids and Bases - Basic Introduction - Organic Chemistry
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- čas přidán 29. 06. 2024
- This video provides a basic introduction into acids and bases with reference to organic chemistry. It explains how to write acid base reactions as well as how to determine the conjugate acid and the conjugate base. It covers the brownsted lowry definition of acids and bases as well as the lewis version. This video also explains how to determine if an acid base reaction is product favored or reactant favored.
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For the last example in the video, the reaction between F- and CH3OH is reactant favored because the pKa of CH3OH is greater than HF (thus CH3OH is weaker acid). Why do we not consider pKb in determining which side is favored?
pKa and pKb are related: 14 = pKa + pKb. You can use either set or even a blend of pka and pkb values to determine the direction of the equilibrium. The smaller the pka, the greater the pkb, but since the conjugate pair is on the other side, your answer stays the same.
It's a year now😮...but I think we were given pka of the acid (Ch3OH) and it's conjugate acid (HF)....so I'm not sure there would be a need to be comparing the pkb of their conjugate bases....you might as well end up confusing your self...I was almost confused and had to refer back to the video ...I now realised what he was doing😂....I've gotten it now more clearer...but I think ...you can also reference to see it...thanks😊 25:40
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At 25:45- why did B become -1. Shouldn’t B be -2 as it has 5 Ve’s (in BH3) and should have 3?
28:18 Doesn't the universe tend towards disorder and entropy? If so, shouldn't the reaction go towards the unstable side?
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What about the structure tells us which is the bronsted acid/ base? You don’t say why HF is acid or why NH3 is base. Please clarify, I would rather not have to memorize weak acids/ bases.
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In this process( HF + H2O ) becomes( F- + H3O +) and it is said to be a reversible reaction!
Why does HF + H2O have to become F- + H3O + and reverse back to HF + H2O ?
It can just not form F- + H3O !!
Please reply 🙏 🙏🙏
I know it is a silly question but I just wanna know!!
because F- conjugate base of strong acid HF which will dissociate completely in water.therefore is no way for ths reaction to be reversible reaction.it's done in one direction.
HF is not strong @@hakimalaourai276
What is the meaning of pa?
So I'm having a problem. How do I know which acid is stronger without a given pka or ka.
basic strong acids: HCl, HBr, HI, HNO3, H2SO4, HClO4, HClO3 basic weak acids: HF, NH4, CH3COOH, H2CO3, HNO2, H2SO3 you should memorize all of them
@@MrChAcHa96 Yes but what makes them strong acids and strong bases? Is there a consistent rule that can be followed so that we can potentially understand what's going on?
@@noakuu393 actually chemists discovered them so you don’t need to mess your brain to understand properly what’s strong acid or not. But if you want the explanation is the following: take for example HI (pka-10) and HBr (pka-9) both strong acids, remind that stronger the acid weaker the conjugate base and more stable it is. Iodide(I-) it’s a bigger anion than Bromide (Br-) therefore it has more space to stabilise negative charge, and if you can stabilise a negative charge you can make the ion more stable which means a stronger acid. And because Iodide is more stable it doesn’t have a strong affinity for H+, therefore it’s a strong acid, it’ll ionize in H+ and I-
Hope this satisfy your doubt
@@MrChAcHa96 Question what if its HNO3 + H20--->
@@jizla9061 To start you would have to figure out which one is your acid and which one is your base. HNO3 is a strong acid but water has been known to act as either an acid or base. Since you have a strong acid present water would be the base in this situation. Hope that helps!
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What it's something like HNO3 + H20--->
Wdym?
Acid pH value is less than 7 and pH value of base greater than 7
you didn’t explain why HF was the acid and why h2o was the base
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