Posted by Laura on Sunday, April 6, 2008 at 12:46am.
Based on what I can find on the internet, ascorbic acid is a monoprotic acid. If that is so, then let's call ascorbic acid HC.
Then HC ==> H^+ + C^-
Ka = ((H^+)(C^-)/(HC)
If pH = 2.40, then (H^+) = 0.00398/
(C^-) is the same.
(HC) = 0.2 = 0.00398
Plug in the Ka expression and solve for Ka. I get a little over 8 x 10^-5 which gives a pKa of 4.09 which isn't far from the pKa listed in my quant book of 4.17.
Thank you! Umm...Whats a quant book? A book read by extraterrestrials??:P
Quantitative analysis chemistry book
Related Questions
chemisrty - Q1) A solution of ascorbic acid (C6H8O6, Formula mass = 176 g/mol) ...
NEED HELP WITH CHEMISTRY HW - Ascorbic acid (vitamin C) is a diprotic acid ...
chemistry - A student prepares a 0.20 mol/L aqueous solution of ascorbic acid ...
urgent i need help within an hour! - Ascorbic acid (vitamin C, C6H8O6) is a ...
chemistry - A solution that contains 55.0 g of ascorbic acid (Vitamin C) in 250...
chemistry - Titration of Vitamin C tablets Prior to titration, Vitamin C samples...
Chemistry - A solution of I2 was standardized with ascorbic acid. Using a 0.1000...
Chemistry - 1. An aqueous solution contains 0.154 M ascorbic acid (H2C6H6O6) and...
Chem - Dissolving 3g of ascorbic acid in 50g of acetic acid lowers the freezing ...
chem 2 - What is the pH of a solution that consists of 0.50M H2C6H6O6(ascorbic ...
For Further Reading
