# chemistry

posted by .

What molar ratio of acetic acid to sodium acetate is required to create a buffer solution at a pH of 4.89 at 25 degree C? Ka for acetic acid is
1.8 X 10-5

A. 2.9
B.0.56
C.1.4
D.0.72
E.0.2 ( I chose this and got is wrong)

I'm lost on how to do these problems, but I started out...

4.89=4.74 + log

got lost after that...

• chemistry -

pH = pKa + log (base)/(acid)
4.89 = 4.74 + log(b)/(a)
Solve for base/acid ratio. That's the ratio they want.

## Similar Questions

1. ### chemistry

You want to make an acetic acid/acetate buffer, pH 3.8, with a volume of 250 mL, and a final concentration of ([AcOH] + [AcO-]) = 0.1 M. You may only use acetic acid and sodium acetate (no strong acid or base). How many mL of glacial …
2. ### school

What is the pH of 0.1 M formic acid solution?
3. ### Chemistry

What molar ratio of acetic acid to sodium acetate is required to create a buffer solution having a pH of 4.83 at 25 Celsius?
4. ### Biochem

You have prepared a 400 mL of a .210 M acetate buffer solution with a pH of 4.44. 1. Determine the concentration of both the acetate and acetic acid in the solution. 2. If you made this solution using solid sodium acetate (MW = 136 …
5. ### BIOLOGY

A reference calls for the use of "one litre of 0.1 molar acetate buffer pH 5.2” Calculate the amounts of sodium acetate and acetic acid required to make up this buffer, given that for acetic acid Ka = 1.8 x 10-5
6. ### chemistry

How much of each solution will you need to mix to obtain 100 – 120 ml of 20 mM buffer pH 4.0?
7. ### chemistry

Calculate the volume of 1.00 M acetic acid solution and mass of sodium acetate needed to make 250 mL of a 0.450 M acetic acid/acetate buffer solution with a pH of 4.00. (The pKa is 4.74 for acetic acid).
8. ### Chemistry

Calculate the volume of 1.00 M acetic acid solution and mass of sodium acetate needed to make 250 mL of a 0.450 M acetic acid/acetate buffer solution with a pH of 4.00. (The pKa is 4.74 for acetic acid) *Please explain it in detail, …
9. ### CHEMISTRY

Calculate the amount (in mL) of 1.520M NaOH that is required to add the following acetic acid solution to prepare a buffer with the corresponding pH: 30.00mL of a 5.00% (w/v%) acetic acid; the resulting acetate buffer has a pH of 5.75. …
10. ### Chemistry

An acetic acid buffer solution is required to have a pH of 5.27. You have a solution that contains 0.01 mol of acetic acid. How many moles of sodium acetate will you need to add to the solution?

More Similar Questions