Thank you for making this, these are incredible! Why can we discount the x in "0.1252 - x" in the bottom left of the second ICE table? Are we making the x is small approximation?
Excellent question! You *do* need a second ICE table for that particular problem. The only time you do not need a second ICE table is when both the acid and base are strong. Your base, C2H3NH2, is a weak base. It makes C2H3NH3+, which is a weak acid. Your second ICE table will be C2H3NH3+ reacting with water. (Even if the reaction does not produce water, the reactants C2H3NH2 and HCl are both solutions in water. We know they are solutions in water because they have concentrations / molarities, which means that they are dissolved in water.)
I calculated the molarity of the 2nd reaction table but ALEKS does not provide any pKa value. The only data they provide is volume of titrant and the molarity of the first and second molecules at 25C. I understand from this point you would use the pKa value to get Kb but if its not provided how to continue? edit: I learned that if both the acid and base are strong then the pH at equilibrium = 7. The problem was asking about HNO3 and NaOH and they're both strong so pH = 7
If one of the products of the first reaction is either a weak acid or a weak base, you have to make a second ICE table showing that weak acid/base reacting with water. That reaction also contributes to the pH of the solution.
its muffled through some of it, but your explanation are saving me right now
You are amazing, and genuinely the only reason I might pass chem 2
ahhhhh you're the one doing all the hard work!! I'm just here to help!
Thank you for making this, these are incredible! Why can we discount the x in "0.1252 - x" in the bottom left of the second ICE table? Are we making the x is small approximation?
Yep! That's exactly right.
This was the worst topic I have had to endure. Thank you!
This one is ROUGH!! I'm proud of you for sticking it out!!
What would you do if the reaction does not produce water and we don't need a second ICE table. For example, my question has C2H3NH2 and HCl.
Excellent question! You *do* need a second ICE table for that particular problem. The only time you do not need a second ICE table is when both the acid and base are strong. Your base, C2H3NH2, is a weak base. It makes C2H3NH3+, which is a weak acid. Your second ICE table will be C2H3NH3+ reacting with water. (Even if the reaction does not produce water, the reactants C2H3NH2 and HCl are both solutions in water. We know they are solutions in water because they have concentrations / molarities, which means that they are dissolved in water.)
@@RoxiHulet ahhhh okay thankyouuu🙏🏾
@@CharmaineNash Hang in there, this is one of the most difficult things you have to do in gen chem!
I calculated the molarity of the 2nd reaction table but ALEKS does not provide any pKa value. The only data they provide is volume of titrant and the molarity of the first and second molecules at 25C. I understand from this point you would use the pKa value to get Kb but if its not provided how to continue?
edit: I learned that if both the acid and base are strong then the pH at equilibrium = 7. The problem was asking about HNO3 and NaOH and they're both strong so pH = 7
Ah! Thank you! I’ve been so confused when people have said they had no Ka or Kb but solved it anyway. Thanks for letting me know!
Could you explain a bit more why we need to make a second ICE table?
If one of the products of the first reaction is either a weak acid or a weak base, you have to make a second ICE table showing that weak acid/base reacting with water. That reaction also contributes to the pH of the solution.
@@RoxiHulet thank you soooo much!!!!
How did you get the ph in the last part of the video?
pH + pOH = 14
do you do the same process is aleks provides you with a pKb value?
No idea if you still need help, but pKb is found by doing 14-pKb since pKa + pKb always equals 14.
Is there a difference between the two videos that you’ve made on titration?
I have a lot of videos on titrations - which particular one are you asking about?
what do you do if theres no pka given
Hmmm... do you have a Ka? If you don't have a pKa or Ka, what data does the problem give you?
nothing other than what was already given hahaha, but no worries! I managed to figure it out@@RoxiHulet
how did you figure it out? @@doghousemma7894
I'm also curious to know what information is provided if it is not Ka or pKa...
how did you figure it out? my ALEKS question also did not give me a pka or Ka or even a pkb@@doghousemma7894