# chem ap

posted by .

please tell me if i am correct
a buffer is made using HF and NaF-with a pH of 3.00. compute the ratio of the conjugate base F- to weak acid HF.
I previously found Ka of HF which is 7.2x10^-4 and the ph of HF is 3.15.

the concentration of NaF would be 1.00x10^-2 ????

and so the ratio would be 1.00 over 7.2 x 10^-2 ??

• chem ap -

Use the Henderson-Hasselbalch equation.
pH = pKa + log [(base)/(acid)]
3.00 - 3.14 + log B/A
solve for the ratio of B/A. I get 0.72 but check my work.

## Similar Questions

1. ### CHEMISTRY

HOW CAN U TELL IF HNO3 +KNO3 IS A BUFFER SOLUTION A buffer solution must contain a weak acid and its conjugate base OR a weak base and its conjugate acid. HNO3 is a strong base and KNO3 is the salt of a strong base (KOH) and a strong …
2. ### Chemistry

Two of the questions my teacher put on the review sheet for our Acid/Base test are 1) what is the characteristic property of a buffer solution?
3. ### chem

Ok so for question I have to state whether the element/compound is an acid, base, conjugate acid or conjugate base. Can u please tell me if i am correct and help me out with the ones i am unsure what the answer is?
4. ### chemistry

Write an equilibrium reaction for a buffer system made of the weak base, B, and its conjugate acid. If the buffer contains 1.05 M of B and 0.750M conjugate acid and has a pH of 9.50, what is the pH after 0.0050 mol HCl is added to …
5. ### Chemistry

You are given an assignment to make 250ml buffer solution having 0.25M weak acid and 0.2M of its conjugate base. You have stock solutions 1.5M acid and 0.5M of the conjugate base. Clearly explain how you are going to make this buffer …
6. ### Chemistry

You have two buffer solutions 1) weak acid and its conjugate base 2)weak base and its conjugate acid. Write explicitly ( considering generic formula for acid and base) the equations of neutralization when you: a) add strong acid and …
7. ### chem 2

A buffer solution is made using a weak acid, HA. If the pH of the buffer is 1.0 × 101 and the ratio of A– to HA is 10, what is the pKa of HA?
8. ### chem 2

A buffer solution is made using a weak acid, HA. If the pH of the buffer is 1.0 × 101 and the ratio of A– to HA is 10, what is the pKa of HA?
9. ### Chemistry

Select the statements that correctly describe buffers.?
10. ### Chemistry

The pH of a buffer can be predicted using the Hendersen-Hasselbach equation: pH=pKa+ log([conjugate base][conjugate acid]) The choice of the conjugate acid-base pair (as you did in the previous questions) determines the pKa value to …

More Similar Questions