Analytical Chemistry involving buffer

AI Thread Summary
To create a buffer solution with a pH of 3.37 using 0.200M HCl and 250.0ml of 0.300M sodium mandelate, the dissociation of HCl must be considered as it fully dissociates. The pH equation pH = pKa + log [A-/HA] is applicable, but the pKa value for sodium mandelate needs to be known for accurate calculations. The discussion emphasizes that HCl will protonate some of the sodium mandelate, and this process should be treated as stoichiometric. Understanding the relationship between the concentrations of the acid and its conjugate base is crucial for achieving the desired pH. Accurate calculations will depend on knowing the pKa of the buffer system involved.
jkh4
Messages
49
Reaction score
0

Homework Statement



What volume of 0.200M HCl must be added to 250.0ml of 0.300M sodium mandelate to produce a buffer solution with a pH of 3.37?


Homework Equations


The Attempt at a Solution



For 2 and 3, can I use the equation pH = pKa + log [A-/HA]? but for HCl isn't that 100% disassociation? How can we use that if the Ka is not a given value for HCl?

Thanks.
 
Physics news on Phys.org
You are correct... Think of the HCl being used only to protonate a portion of the sodium mandelate.
 
And assume this protonation is stoichiometric.
 

Thread 'Prove that evolution is constant (Provide at least two arguments to support your position)'

I don't get how to argue it. i can prove: evolution is the ability to adapt, whether it's progression or regression from some point of view, so if evolution is not constant then animal generations couldn`t stay alive for a big amount of time because when climate is changing this generations die. but they dont. so evolution is constant. but its not an argument, right? how to fing arguments when i only prove it.. analytically, i guess it called that (this is indirectly related to biology, im...
View full post »

Similar threads

Chemistry Comparing methods of computing pH at equivalence point in titration
Replies
4
Views
1K
Chemistry Moles of NaOH to Create Buffer Solution pH=6 in 0.42M Ethanoic Acid
Replies
3
Views
3K
Best optimal buffer, highest buffering capacity against naoh
Replies
7
Views
6K
Chemistry Solving pH Changes: Adding Acid to a Buffer or Water
Replies
16
Views
3K
Chemistry Moles of a conjugate base in a buffer solution
Replies
7
Views
3K
How Does Temperature Affect pKa Values in Buffer Preparations?
Replies
3
Views
3K
Creating a buffer out of 0.100M solutions
Replies
1
Views
2K
How do I find the ph without using Hasselbach's equation?
Replies
1
Views
2K
I need some help in this question please check what i have done
Replies
5
Views
2K
Two questions about the pH of buffers after solutions are added questions
Replies
5
Views
5K

Hot Threads

Recent Insights

Back
Top