The "Rule of 100" for Equilibrium (ICE Table)

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If K is way smaller than the concentration you're given, then you can make an "assumption" that simplifies your calculation.
In reality, no one quotes the Rule of 100, and we just make simplifying assumptions when K is "really small" which is a really relative term.
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21 фев 2013

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Комментарии : 66

@TheCanadianKush 8 лет назад

If a millionaire drops a dollar he isn't a millionaire anymore... I think he'd be pissed

@boss8177 6 лет назад

that's assuming that the person has exactly one million dollars which he probably doesnt. He might have 1 million and 1 dollar or more...

@IvanMTG1 6 лет назад

HILARIOUS!

@sanchezmd605 10 лет назад

In my university, they taught us "the rule of 1000" where c/k should be greater than 1000 in order for -x to be removed.

@ompatel621 2 года назад

in high school I use 500. Increasing the number I guess can potentially lower the accuracy of the answer

@zubincannivady2589 3 года назад

Hey man, just hope you know that this video you uploaded 7 years ago has helped me today. Thanks a million!

@jirehpellazar3054 3 года назад

dudee funny seeing you here

@zubincannivady2589 3 года назад

@@jirehpellazar3054 LMFAOOOO THE ODDS 😂 but yea I was so confused when he taught it in class😂😂😂

@IvanMTG1 6 лет назад

i love your channel, such grace, such intelligence, such clarity

@evanmsitler1 11 лет назад

Cool beans man. My Chem Professor has been using this method, referring to it as the "simplifying assumption", Every time he brings it up during equilibrium he rushes through the method without actually explaining what he's doing. Thanks for the breakdown. very helpful.

@GioZane14 9 лет назад

Thank you for clarifying this, couldn't find anything like this on the web

@BUSCUS012 9 лет назад

What is the border line for how small x is to be considered insignificant to the equation? -Matt Takane

@berezker 8 лет назад

How come they never teach this in some schools? We tediously have to use the quadratic equation to find this which takes ages especially numbers less than 1 like 0.024

@jamifrig 8 лет назад

it would be a bit less confusing is you used M for concentration in the C/K expression but still a lot better than however my professor attempted to explain it

@queenrose7202 8 лет назад

What if you don't have Keq and are only given a pressure of initial and a pressure of final? After you use the quadratic equation, how do you know which x to use?

@OCoptimusconvoy 9 лет назад

Wow this was extremely helpful thank you!

@kevincorvallis 7 лет назад

You helped me so much. Thanks homie

@emitain8408 3 года назад

What about if you have a coefficient before the x?

@kennthii1 4 года назад

May I ask what "Constant" exactly means? I don't have a clear definition and image of it. What will happen if constant of something is very large of small? And what does it represents?

@VSPG_SIVANI 6 лет назад

It's coincidental that I too have cold while watching this video, Nate

@madihatahira7063 9 лет назад

Thanks :D i really needed this

@hehehhgujgi5064 9 лет назад

Thank you, so so much, helped A LOT

@jordanbryant7285 8 лет назад

what if you have two initial concentrations? Would you multiply them or add them, then divide by 100?

@jasen951 3 года назад

You use the smallest non-zero initial concentration

@Strom308 6 лет назад

If the exponent of the Kb is less than 10^-3 you can assume that x is negligible.

@chuelo858 7 лет назад

How "small" does K have to be to assume it has "negligible" effect?

@olo33xmillz99 6 лет назад

Kc values less than 10^-5 tend to have a negligible effect but you still have to check. 10^-4 may or may not. Bigger values tend than those previously mention more likely than not will have a significant effect.

@freedomofspeech122 5 лет назад

To know if X is negligible, there are two ways to check. One is calculating Concentration divided by the Constant (whether its Kb or Ka), and finding is greater than 100. If it is, it's neglible. If not, do the quadratic formula. If percent ionization is under 5%, you're good. The other way is to check if the constant is much smaller than the original concentration, which also makes the influence of X insignificant. Hope that helps.

@s.chauhan6423 4 года назад

different states?

@vannahbliss 11 лет назад

oh my goodness I wish I would've known this earlier in the semester! Thanks for the video, at least it'll be helpful for my final

@romantsar8344 3 года назад

how did you do on your final

@s.chauhan6423 4 года назад

if k is smalller than reactin shifts to left

@utubemusiccritic 11 лет назад

Never saw "Rule of 100" in a textbook. However, some textbooks (e.g.- Zumdahl) use the better known "5% Rule." Google it for more info.

@pandugus1550 5 лет назад

Check : Brady - Chemistry The Molecular Nature of Matter 6th ed. Page 783

@tenn1sball3r88 11 лет назад

Do you happen to have Professor Smyth? lol. That's my chem professor and it's like he's on speed every lecture.

@manigill8571 10 лет назад

it has to be greater than 1000 not 100. Just in case if someone is confused about tho

@CinShummi 6 лет назад

I tried calculating it and was confused about the findings. Thanks for clarifying this.

@maxmarshall1260 5 лет назад

Lol then why is it the rule of 100... did you even watch the first 3 min of the vid?

@NurseCloud9 5 лет назад

My school does it by 500😬

@paulsimon5578 5 лет назад

@@CinShummi How did you do the calculations?

@JadenSmithxox 8 лет назад

Thank you!!

@GattedGazoo91 7 лет назад

is i K sub b or K sub c

@arineko5356 9 лет назад

Thank you so much :3

@xtcy7137 5 лет назад

What if your Kb is 1.8^10 8 ??? A big number?

@zubincannivady2589 3 года назад

I know im a year late, but that means you can't ignore it and have to use the quadratic formula. if you see this im sure youve already graduated highschool and hence dont need it anymore (unless ofc youre trying to become a chemist)

@dcheney4041 3 года назад

3:25

@shivpalpatine 9 лет назад

Thanks dawg

@bitseatgetaneh3381 5 лет назад

Ahhh you're the best!

@liamsiam1 6 лет назад

Rule starts at 3:03 you're welcome

@AilindaBaptista 11 лет назад

can't use a calculator on my tests.....-____-........this still helps tho

@johnfei434 5 лет назад

That's just stupid. I get it if it's math test.. but chemistry no calculator? That's pretty pointless.

@matthewma6795 6 месяцев назад

times have really changed 10 years later, calculators are pretty much mandatory now

@Nijaanth 6 лет назад

you sound like deadpool

@aaaa-vo1dg 8 лет назад

spasibo

@abduladayel 5 лет назад

This video gave me a clogged nose

@fetramuhammadfeysal1083 4 года назад

you are cool

@marcostavarez2702 6 лет назад

DO NOT WASTE YOUR TIME ON ICE CHARTS!! theres a way to solve these that takes literally 5 seconds to solve

@vanessam157 5 лет назад

spill the tea sis

@tb2748 4 года назад

For those wondering, he's (probably?) referring to the Henderson-Hasselbalch equation, which really only works if x is small relative to our initial concentration, ie, we can make our assumption that x is negligible. Otherwise, you need the quadratic formula/ICE chart.