Find the pH of a Buffer after Adding HCl

You use the Henderson-Hasselbalch equation to calculate the pH of a buffer, and you can use MOLES of conjugate base and MOLES of weak acid in the "base over acid" section. Adding HCl will *increase* the amount of weak acid there is, and decrease the amount of conjugate base by the same amount.
These affect the ratio that is logged, so adding a little bit of HCl doesn't change the pH significantly.

[tanyathep]

Words cannot describe how grateful I am for this. Thank you for providing free and comprehensive educational content for those who need it!

[omarfares]

you are the best, the way u explain things make life easier and you also choose problem ideas that most teachers don't explain. you are a life saver :)

[samyaely]

how does it feel to be loved by the many college students in need...me incl

[TutuPharouk]

When you add that volume of acid, won't the volume of the buffer be affected hence won't there be change in the volume of the buffer?

[mitsu]

wow, this is much easier than using an ice table (also saves space)! thank you so much!!! i was pulling my hair out a while ago going crazy at not being able to grasp the problem in front of me. now i can easily solve it haha!

[drmini]

Thank you so much, I was even stressed failing to solve these kind of problems. Much simpler, appreciated!

[Yourgray]

my lecturer taught this for 5 day repeatedly, nobody understood.

[omarburhan]

Does anybody how to calculate the pH if there is let’s say 11ml of the HCL that overwhelms the buffer neutralising the conjugate base? What equation do we use?

[calebschofield]

Very appreciative! I surprised you didn’t use an ice table to solve, but I understand the concept a lot better because you chose not to! Thanks again!

[kurogiri]

What would i do if the moles of HCl added is higher than the moles of the buffers? For example the question I'm tackling is "0.250M of HCO3- in 500ml with 0.350M of H2CO3 in 500ml. If you add 0.2mol of HCl what is the Ph?"

I tried your method but since there is so much HCl added, the whole thing neutralizes and I can't figure out how to get an answer

[inteesarahmed]

Would anything change if H2SO4 is added instead or the whole process is same ?

[ess]

thanks so much...I've had a loong night trying to find how to solve this problem...you did it perfectly

[nekofan]

Excellent explanation, you save me!! thank you!!!

[haroldcooper]

thanks good explanation or either way u showed me some that i think my teacher has never said cuz i havent seen this ever. But i have a full course test tmrw

[skeembruh]

A question, how did you get the pKa value?

[sydkneee]

You just taught me 2 weeks of college chemistry content in 5 minutes🙏

[ziggeu]

Thank you!! This video was incredibly helpful!

[c.hibz]

God bless you, you just saved me for finals

[SaraAljanabi]

thank you soo soo much this helped alot

[pastelhobi]

why did you multiple 1 x 0.001 dor 1 ml of 1M and not 1x 1. im confused where the 0.001 came from