Homework Help: Chemistry

Posted by Alice on Monday, February 16, 2009 at 4:02pm.

What is the pH of a solution made up of 50cm^3 of 1M Ethanoic Acid and 25cm^3 of 1M sodium ethanoate? Assume Ka for Ethanoic acid is 1.8 x 10^-5 mol dm^-3

I'm not quite sure how to do this. I was going to use the equation pH = pKa + log[A-]/[HA] but it doesn't seem to work

Chemistry - DrBob222, Monday, February 16, 2009 at 4:14pm
You're right. The Henderson-Hasselbalch equation is the one to use. If you want to post your work someone will take a look and try to find the error. You should be substituting 25/75 for for the base and 50/75 for the acid. The denominators cancel, of course, and you have just 25 for (A^-) and 50 for (HA)

Answer this Question

Related Questions

Chemistry - Given that for ethanoic acid pKa=4.75, calculate the pH of sodium ...
chemistry - the pH of the solution obtained by mixing 400ml 0.1M acetic acid, ...
AP Chem - Calculate the correct volumes of the 0.1M acetic acid solution and the...
Chemistry - Acetic acid has a pK of 4.8. How many mL of 0.1M acetic acid and 0....
Chemistry - IN the polystyrene beaker, mix 20mL of 0.1 M Acetic acid and 25mL of...
chemistry - What is the pH of a solution when 1ml of 0.10M NaOH is added to ...
Chemistry - I did an experiment on Buffers: In a polystyrene beaker, mix 20 ml ...
chemistry - If a solution were made by mixing equal volume of 0.1M acetic acid(...
Chemistry - The Ka value for ethanoic acid is 1.8x10^-5, what would be the pH of...
Chemistry - The Ka value for ethanoic acid is 1.8x10^-5, what would be the pH of...

For Further Reading

First Name:
School Subject:
Answer: