Go Back   Chemistry Help Forum > Chemistry Forums > Advanced Chemistry Forum

Advanced Chemistry Forum Organic chemistry, analytical chemistry, inorganic chemistry, physical chemistry, and biological chemistry questions go here.

Reply
 
Thread Tools Display Modes
Old Mar 29th 2019, 06:34 AM   #1
samsamsamsmasmasma
Junior Member
 
Join Date: Mar 2019
Location: the world
Posts: 2
samsamsamsmasmasma is on a distinguished road
carboxylic acid/koh calculating titration curves

Hi,

I am attempting to calculate various theoretical tittration curves for a strong base weak acid titration: similar to the one in this wiki:https://en.wikipedia.org/wiki/Neutralization_(chemistry)

I don't have any difficulty calculating the inital ph or the pH at/after the equivalence point. For the calculations of pH before the equivalence point, it seems the hasselbalch equation (http://wpage.unina.it/petrilli/chemb...areac.htm?html) can be used. There is also the derived approximation in the wiki that can be used.

The hasselbalch equation just seems to be outputting the same curve, regardless of concentrations, which does not match with the rest of the calculations. The approximation in the wiki does not seem to output anything useful.

Here is a excel sheet with my current work. Ignore the graph as it does not transfer to google sheets correctly.

https://docs.google.com/spreadsheets...it?usp=sharing

correct graph: https://i.imgur.com/5TZ3fQ8.jpg

Any help would be appreciated.

Last edited by samsamsamsmasmasma; Mar 29th 2019 at 06:40 AM.
samsamsamsmasmasma is offline   Reply With Quote
Old Mar 30th 2019, 05:55 PM   #2
samsamsamsmasmasma
Junior Member
 
Join Date: Mar 2019
Location: the world
Posts: 2
samsamsamsmasmasma is on a distinguished road
I seem to have found a solution for anyone that cares. Although, I don't quite understand where the equations come from, the seem to consider what I was missing.

https://www.chemicalforums.com/index.php?topic=80995.0
samsamsamsmasmasma is offline   Reply With Quote
Reply

  Chemistry Help Forum > Chemistry Forums > Advanced Chemistry Forum



Thread Tools
Display Modes



Facebook Twitter Google+ RSS Feed