Homework Help: Chemistry

Posted by Hannah on Saturday, April 14, 2012 at 9:00pm.

A buffer solution is prepared by adding 14.37g of NaC2H3O2 and 16.00g of acetic acid to enough water to make 500mL of solution.

What is the initial concentration of C2H3O2 in the solution?

Ka(HC2H3O2)=1.8e-5

HC2H3O2 = H3O+ + c2h3O2

the molar mass of NaC2H3O3 = 82.04

I know that m=mol NaC2H3O2 / L
so would I do 82.04 / .05?

Chemistry - DrBob222, Saturday, April 14, 2012 at 11:08pm
You don't know that m = mol NaC2H3O2/L; because m stands for molality. You may know that M = mol NaC2H3O2/L since that is molarity.
mols NaC2H3O2 = grams/molar mass
mols HC2H3O2 = grams/molar mass
M of each = mols/0.500 L

Then pH = pKa + log(base)/(acid).

Answer this Question

Related Questions

school - What is the pH of 0.1 M formic acid solution? Ka=1.7„e10-4? What ...
Chemistry 122 - A solution is prepared to be 0.10 M acetic acid, HC2H3O2, and 0....
Chemistry - Say, for example, that you had prepared a Buffer C, in which you ...
Chemistry - Say, for example, that you had prepared a Buffer C, in which you ...
Chemistry PLEASE HELP!!!!! - Say, for example, that you had prepared a Buffer C...
Chemistry (buffers) - Say, for example, that you had prepared a Buffer C, in ...
chemistry - A solution of acetic acid is prepared in water by adding 11.1 g of ...
Chemistry...Help please!!! - A solution of acetic acid is prepared in water by ...
chemistry - what is the PH of a solution prepared by adding enough water to 15....
chemistry - A buffer is made by adding 0.300 mol HC2H3O2 and 0.300 mol NaC2H3O2 ...

For Further Reading

First Name:
School Subject:
Answer: