Posted by Reen on Wednesday, March 3, 2010 at 10:55pm.
9.00mL of 1.10M CH3COOH and 1.00mL of 0.900M CH3COO- what is the pH?
- buffers - DrBob222, Wednesday, March 3, 2010 at 10:56pm
Use the Henderson-Hasselbalch equation.
- buffers - Reen, Wednesday, March 3, 2010 at 11:03pm
we havn't learnt that equation.
- buffers - DrBob222, Wednesday, March 3, 2010 at 11:12pm
pH = pKa + log(base/acid)
pKa is pKa for CH3COOH
base is (CH3COO^-)
acid is (CH3COOH)
- buffers - Reen, Wednesday, March 3, 2010 at 11:18pm
thanks. so for this question is the pH 3.70?
- buffers - DrBob222, Wednesday, March 3, 2010 at 11:27pm
Or you can do it another way.
Write ionization of CH3COOH.
CH3COOH ==> H^+ + CH3COO^-
Now write the Ka expression.
Ka = (H^+)(CH3COO^-)/(CH3COOH)
Now plug in (CH3COO^-) from the problem.
Substitute (CH3COOH) from the problem.
Substitute Ka for CH3COOH. Try to find Ka in your text or notes but it's very close to 1.8 x 10^-5. Calculate (H^+) and convert that to pH.
- buffers - DrBob222, Wednesday, March 3, 2010 at 11:30pm
I calculate 3.698 pH which rounds to 3.70. Yes. Very good.
- buffers - Reen, Thursday, March 4, 2010 at 12:03am
thanks a lot :D
- buffers - DrBob222, Thursday, March 4, 2010 at 12:17am
Answer this Question
More Related Questions
- chemistry - In Chemistry: what is ph during the titration of 20.00ml of 0.1000m ...
- Chemistry - Given one of the following solution: 50.00mL of 0.10M of K2CrO4 ...
- Chemistry - 10.0 mL of a 0.300M NH3 solution is titrated with a 0.100M HCl ...
- Chem - Write the equation for dissocation of acetic acid in water: My Answer: ...
- chemistry - What is the value of [OH-] in a 0.015 M CH3COOH solution? Ka = 1.8 x...
- chm - What is the pH of the solution obtained by mixing 30.00mL OF 0.250M HCL ...
- chemistry - determine h30+ in M, of 10.00ml of .100M NaOH after adding 10.00ml ...
- Chemistry(Please check) - (0.80M)(5.00mL) = c2 (75.00mL) c2 = 5.33e-2 M Is the ...
- chem - What is the pH of a solution prepared by diluting 25.00mL of 0.020M ...
- Chemistry 102 - For a question like “calculate the pH of an aq.solution that is ...