What is an equivalent? | Lab values and concentrations | Health & Medicine | Khan Academy

Figure out how to calculate an equivalent and how it relates to a mole. Rishi is a pediatric infectious disease physician and works at Khan Academy. Created by Rishi Desai.
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[@slwankaedbey775]

I understand how it works but THE BIG BIG PROBLEM is that I really don't know why they invented this term in the first place?? what is the purpose of it?? we have Moles and other units so what info does this Unit provide that is too important to deal with it in daily bases? need to clarify

[@shivangswain]

Well, the branch of electrochemistry is totally based on equivalence. From electroplating and surface adsorption to batteries and mineral refinement, everything requires both moles (ie mass) & charge of its constituents to be considered. This is why the concept of Equivalent was introduced. Nothing about this unit (or as a matter of fact any unit) is useless.

[@slwankaedbey775]

Thanks for clarifying Shivang, I see your point.

[@MrKaplanFilm]

So basically, it is a value to tell us how to "reach" neutral charges in solutions? I agree with Slwan, because as a medical student I don't see the relevance of it.

[@gabrielchris5163]

simply they invented equivalence or more precisely they discovered it by experience before the establishment of stoechiometry and before the acceptance of atomic theory the first equivalence tables date back to 1777 so normality and equivalence are the original expression of concentration and not molarity and had a huge impact on the developpment of chemistry as quantitative science , but it became now obsolete

[@somerandomuserfromootooob]

They got bored using moles and wanted to invite a fancy term.

[@Salindaparmar]

great explanation! you are right ... the Wikipedia explanation was useless

[@MrKaplanFilm]

Totally agreed.

[@user-po3ii1tl9z]

@Aditya N Bharadwaj LOL

[@rr.studios]

@Wilder Hugo I swear I keep seeing these bots EVERYWHERE

[@simranjoharle4220]

This is the best explanation I've ever come across.....thanks a lot

[@ЛюдмилаКазимирчик-р5е]

Прекрасное объяснение! Спасибо!

[@9-volt247]

@@ЛюдмилаКазимирчик-р5е English Translation: Great explanation! Thank you!

[@samijoe2546]

You deserve more than 5 million subscribers, you explain better than Wikipedia and the teacher, thank you :)

[@jordcf918]

Thank you so much for the help, you're super easy to follow and understand. My book goes into little detail and I was pretty confused, but it's actually pretty elementary. Thanks!!!!!!

[@chandanikumari-kv8gg]

What are you doing right now as its 8 year of your comment

[@musicaldramaqueen]

Me too! Same with my book.

[@farhanalam2101]

Finally i got someone who explained the logics behind introducing this term.. Thank you🎉

[@stupidape]

I always tries to understand concepts from different sources, but I always end up understanding it at Khan Academy. Keep helping us!

[@bhavishyasharma7834]

And keep supporting them with donations

[@Crispy_Treat]

I was studying Normality and was so damn confused on Equivalents and let me tell how easily I understood this! Like hello?? I struggled on this concept for an hour and this is all there is to it? Like thank you and thank youuu!!

[@voornaam3191]

Great video! Thanks. I did chemistry at school. That's six years of basics chemistry! And we had pretty good teachers, one discovers such things later. Not all schools are equal. Fourty years later I still remember what mol is. So mEq is easy. However, not everybody has basic knowledge of chemistry. So, thanks for this video, curious people need such video's. Your explanations are very okay. Besides, one of our chemistry teachers often said mo-mo-mo-mo-molecules-yes. All these Latin words are co-co-complicated.

[@shyamks223]

No one explains like you do!! Thank you so much

[@saksham5882]

Thank you Khan Academy iss the BEST !!!!!!!!!!!!

[@abhishekillusion14]

Best explanation... Beautifully made me understand

[@Yamakne733]

Arigato❤

[@raiyanriyad6633]

Thank you very much,it was so easy to understand without any confusion, thanks a lot again.

[@NiharikaAChirayil]

Thanks for the video it helped!

[@alankrithramesh7282]

As I understand: 1 Equivalent is 1 mole divided by the valence (or charge) 1 Eq = 1mol/valence. Please correct if any discrepency.

[@vidhyak3421]

Greatly helped me ! Thanks so much !

[@rashmikumari4258]

best of all thank you cleared my concept #equivalent is just number @ requirement 1 mole oppositely charged monovalent ion or just hit the valency....

[@chienyilow6474]

Thank you thank you I was struggling to understand what equivalent means but now I have a better idea

[@shincho5508]

Many many thanks *** for helping me to understand the basic concept of ~ *** the best video for the EL like me *** from the South Korea

[@lydao002]

This is so easy to understand!!! Thank you so much!

[@JAY-xx7zl]

Thank you so much for this vedio sir, Thanks for making me understand ❤

[@lisali6178]

Thank you for your perfect explanation! It's very useful!

[@julienrkjr2140]

Ammonia is produced by the reaction: H_2(g) + N_2(g) -> NH_3. Is 12.5g of H_2 the equivalent of 25.3G of N_2? If yes or no, how do I figure it out?

[@poojangharat5385]

Mole is the general concept as it describes the amount of any element or molecule whereas the equivalent applies to chemical reactions including redox reactions. more precisely the equivalent concepts tell us the part of a mole of one reactant that is actually needed to react with the one mole of another reactant.

[@Stoney-g1o]

You might create a video to explain how this would apply to dosage information that is given in milli equivalents.

[@ganeshkumarvasudevan5758]

Nice explanation. Thank u

[@Treacs05]

Thanks. Very clear explanation

[@cindycuriel8010]

Amazing explanation!!!!!

[@esrahawamdeh4280]

Clear n easy 😄 thnk u

[@D4n21]

THIS WAS SO CLEAR!!! Thank you!!!!!!!!!!!! :)

[@JoseGonzalez-ed4hq]

So 1 equiv is 1 mole right ? So it depends on the chemical right ?

[@ExploreMalaya]

Thankew U r better than wiki

[@papiab8377]

Thank you...but quick Q, what about when both opposite sides come with more than 1 charge???

[@chandrashekhargupta5989]

Thanks for clearing very basic concept

[@zazopink6449]

Don't know why its important to learn this but at least I understand it

[@deepakbellur9676]

Thank you Sir! It has been explained very clearly !

[@amritbhusal3542]

Nice yrr, clearly understood

[@belle8606]

Thank you

[@VG__]

Was this so simple?🥺

[@rlafhaks]

Thank You. This clarified why the equation is Equivalents = moles * valence. Hopefully I will one day understand why we use Equivalents.

[@yashbendale212]

Haaat

[@atikaamsir5099]

why dont you show of NH3CO2H ? idont know how to calculate the equivalent of this

[@yarenkocer6714]

thank you!

[@greedskith6612]

THANKSSSSSS!!!!!!

[@abbtravels5139]

Thanks man! 🧡

[@hiraya3]

So equivalent is different from equivalent weight?

[@affanmohidden5474]

Superb explaination

[@quriositysquared1028]

Thanks a lot. I feel lot more comfortable now.

[@kanviaery2542]

I have a doubt ... If we take eg of Al2O3 , we can find its equivalent weight but oxygen is not in monovalent??

[@shatakshishelar5471]

Take AlCl3

[@Abdullah-CoA]

Perfect 🔥

[@mallakaljarawen888]

super useful!

[@Gargi-1622]

moles of thanks to you ❤

[@basmaaly1486]

whyyy no of moleces of calcium to balane one mole of cl-===== then itis euivalent is half not 2?? can understand

[@sriramiyer9840]

Please help me with this sir. Why is 1mol of h+ = 1eq?? Why not 1mol of n3- = 1eq and 1 mol of h+= 1eq??

[@sriramiyer9840]

And I do not intend to talk about only this specific example. I don't get it in all the examples. Please help.

[@yashmehan3944]

we calculated number of moles of K+ ion (for example) to neutralize an oppositely charged monovalent. But how do we calculate if we were to K atoms (neutral) in place of K+ ions? Then we will need infinite moles, right?

[@kashyapmangathaya4173]

Yash Mehan You cannot calculate the equivalent mass for an atom as such, only when it is ionised can you apply this formula.

[@BabaaYaga888]

Equivalency is a variable term, it changes with respect to the other element it's combining with. Here, we see only a given element combining with a monovalent mole, but there can be cases where it combined with divalent mole or even trivalent ones. Equivalency is a relative term, it is always wrt to the element it is re acting with. And reaction will only occur when we consider real charges (in ionic compounds) or at least imaginary charges (in covalent compounds). This being said, we can never consider K (neutral) atom combining and balancing electrons

[@persephone1279]

Khan academy never disappoints!

[@samirabelayel2535]

best explanation

[@roshinis9986]

what if on the other side we don't have a monovalant, the equivalent of a substance will be a variable r8? the equivalent of calcuim will not always be 2. it wud only be 2 if v hav a monovalent on the other side...

[@shivangswain]

Well, Equivalent or Equivalent Weight is the number of moles of a substance required to discharge one mole of a monovalent. That is the definition.

[@salmah.5528]

perfect thanks

[@Geoblek1]

What if you are given the concentration of say CaCl2 and u are to find the concentration of Calcium, CaCl2 has no charge but Ca has a charge of plus 2

[@mouradbalbal8774]

Thanks a lot ❤

[@saiprasadrm97]

Thanks a lot!!

[@kayalvizhigoogle]

thats the best !!!! thanku sooooooo much !!!! oh really ! this means. A LOT. to me !!!

[@georgeg5979]

Em...so basically the ionization = the Eq?

[@latyaz]

what is the equivalent weight of triethylamine

[@9-volt247]

0:02 Why Wikipedia?

[@adhoc4072]

And I think I'd get about the same response if I suggested they were equivalent. Was I pulling your chain reader? You decide. Either way it seems like a matter of fancy and aethetic the way this is set up. How much more, $10 $100 dollars more? Do I have to be involved? important follow ups.

[@oneofthem7992]

Simply put ... an equivalent = a mole of charge .

[@akaki3626]

what if it's 3/2??

[@dr.uditamondal8352]

I wanna know about gypsum equivalent

[@chanisasornso8766]

Hi slwan I love you

[@prateekgurjar1651]

What is equivalent weight ?

[@shivangswain]

Equivalent Weight or Equivalent (≠ Equivalence) is equal to molar mass upon charge (number of H+/OH-/charge on cation)

[@mlpiper11]

Is an equivalent the same as normality?

[@mlpiper11]

Meaning how can I do Equivalents per liter

[@FROPDESAI]

+Morgan Piper For normality, you just take the Weight/Volume ratio (Weight of solute divided by the Volume of the solution in liter) and then divided the Weight/Volume ratio by the equivalent weight of the Compound of whose solution you prepared.

[@BigG-jv3ip]

Does no one see he writes his e's weirdly?! only thing i could concentrate on this whole video...

[@alaeddinekharbache9803]

الهردوزية!

[@NisargaPriyaru]

is it constant for an element

[@itsnick93]

thanks dawg,

[@HAneennm]

So it's literally just a mol to mol ratio? Why did they give it a stupid and confusing name?

[@Manish_12250]

Hay this is India. Please speak in hindi

[@angelsure6332]

Glad I wasn't the only one getting way more confused when watching this lol.

[@dattajawalkar8653]

hidemya

[@kouvasilias123]

it's calcium (Ca2+) stop calling it potassium

[@pratyushbavanari391]

Its potassium....!! :)

[@kouvasilias123]

potassium -> K+ calcium -> Ca2+ he was calling Ca2+ as potassium. just focus on what he was saying

[@scienceman3326]

lel he switched from kcl to cacl

[@keatonfletcher6533]

I was much less confused before I watched this video.

[@mrinalinighosh9573]

welp.....wikipedia is pretty useless

[@SahilChaturvedi]

Are you a lefty?

[@Meganjolie2133]

wow i didnt get nothing!!!

[@DNAatWork14]

homework done in at 11 tonight... SO HARD...

[@cmhardin37]

You got something?

[@arpitarpit4454]

thank god ...I didn't study here

[@itzzakshay1797]

Very basic explanation

[@MrRanol1234]

very bad explanation. not clear at all.

[@prateekgurjar1651]

wow

[@moistorphan]

Thanks this really helped 👍

[@muhammadnaufalhibatullah3260]

thank you

[@ouss991]

great explanation

[@aparnachatterji1]

Thank you. Great explanation