Titration of a weak base with a strong acid | Chemistry | Khan Academy

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Calculating the pH for titration of weak base, ammonia, with strong acid, HCl, before any HCl is added and at half-equivalence point. Created by Jay.
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Опубликовано:

21 авг 2024

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Комментарии : 30

@engkumaryamafifahengkuomar4932 6 лет назад

excuse me,may i ask something.for question b..why we must find the pka?why we not just use pkb?because in that question we use weak base solution ,right?thank you

@noorhigh418 Год назад

Good explination

@mariamlovescoco 5 лет назад

can you explain more why you changed HCl into H3O in the reaction?

@pittbier7597 5 лет назад

HCl is a strong acid and dissociates almost completely into H30+ in the pressence of water.

@chains_of_heaven 4 года назад

H3O+ can be said to be H+ as well but H3O+ shows the reaction with water to balance out the equation :)

@salymamani2794 6 лет назад

can I use the same equations used for 20 mL of HCL for adding any amount of HCL (other than 0mL) before the equivalence point ? like when adding 1mL, 2 mL, 3 mL.....39mL HCL.

@liljerhomie498 Месяц назад

bless

@LauchaRuggieri 6 лет назад

God's work. Thank you very much

@hannanqaisar628 Год назад

at 13:30, how is A- NH3, shouldn’t A- be the conjugate base which is NH4+

@nurlybektoktarov469 2 года назад

Lifehack: put it at the speed 1.5 and Khan Academy will speak like normal human 😄

@dinushamadhuwanthi1204 2 года назад

😁😁

@timsohn7057 3 года назад

One small suggestion (unless I am wrong). During solving this question, I realized it was an half equivalence point since half of the moles of the solution was titrated. Then, pH = pKa. However, I started to struggle to figure out how to go from here, since nothing else was given. I assumed I may be doing something wrong, and started to just go in circles and plugged in numbers. What it have been bad if the question gave us the ka value like many questions do? I thought we had to somehow find out the Ka despite not having given it somehow...I got everything correct up to toward the end except having to use the HH equation. I know I am still learning acid bases and it is tough, but this whole set up made me feel like I was suppose to get a problem that simply did not provide enough information. Other than that, your videos really helped me learn this. Of all sciences, this topic is one of few I never was able to conquer, until these videos! :)

@lailas.9010 7 лет назад

How is ammonia reacting with hydronium a neutralization reaction? 8:25

@zeinabmansi9139 7 лет назад

Laila S. yeah, arent neutralization reactions between a strong acid and strong base?

@entropyfan9417 7 лет назад

well technically a neutralization reaction is "A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate water.", meaning it can occur between weak base and acid, as you see there all of the H+ is going to neutralize the NH3, think of it as an attacker and a defender, the H+ is attacking the base so the base in return goes after the H+ and it neutralizes it to stop the attack, and it ends up consuming itself. tl;dr it can occur between weak base and acid, also damnnnn post it on the forum, (what a small world) [Or small video selection] {or common problem}

@zeinabmansi9139 7 лет назад

Hussein Shareef but NH4+ isn't a salt

@entropyfan9417 7 лет назад

Yea but NH4Cl is, you see they didnt include the Cl- because its netural, but if they were to write the whole thing, it would be NH4Cl, and that is a salt