CHemistry

posted by .

True/ False: The pH of a soln that is 0.20 M CH3COOH and 0.20 M CH3COONa should be higher than the pH of a 0.20 M CH3COOH soln

Would it be true since CH3COOH and CH3COONa are both weak acids, and if you mix them together, it becomes more diluted, and hence should have a higher pH than just simply CH3COOH?

  • CHemistry -

    I didn't work it out. I think it is true, too, but not for the reasons you gave. The acid by itself has a certain pH. The mixture consists of a weak acid (acetic acid) and its salt(the sodium acetate which by the way is a base); therefore, this is a buffered solution. Most, if not all, buffered solutions have a higher pH than the pure acid. I worked it out very quick estimates. The pH of the buffer is 4.74 and the pH of the acid alone is about 2.7.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chem

    Write the equation for dissocation of acetic acid in water: My Answer: CH2COOH + H2O <=> H3O+ + CH3COO- Equation for hydrolysis of acetate anion in water: My Answer: CH3COO- + H2O <=> CH3COOH + OH- Now, using the above …
  2. Chemistry

    You are carrying out the titration of 100.0 mL of 1.000M acetic acid with 1.000 M sodium hydroxide. Ka = 1.76x10^-5 of acetic acid. (a) Calculate the initial pH of your acetic acid sample. (b) Calculate the pH of the solution after …
  3. Chemistry

    Which one of the following pairs of 0.100 mol L-1 solutions, when mixed, will produce a buffer solution?
  4. Chemistry 102

    For a question like “calculate the pH of an aq.solution that is 1.0 M CH3COOH and 1.0 M CH3COONa, how do you know to write the equation like this: CH3COOH + H2O => H3O+ + CH3COO- and not like H3O+ + CH3COO- => CH3COOH + H2O …
  5. Chemistry

    I need to know if I am anywhere in solving this problem: Please tell me if this is correct. The pH of a solution: 0.20 M CH3COOH and 0.10 M CH3COONa pH=pKa+log{[CH3COONa]/[CH3COOH]} pH= -log(1.8x10-5)+log{0.10/0.20} pH= 4.74+log 0.50= …
  6. CHEMISTRY

    The major component of vinegar is acetic acid CH3COOH. Which of the following reactions represents the balanced equation between acetic acid and sodium bicarbonate?
  7. chemistry

    Which of the following has the greatest buffer capacity?
  8. chem 2

    a buffer is to be prepared by adding solid sodium acetate to 0.10M CH3COOH. Which othe following concentrations of sodium acetate will produce the most effective buffer?
  9. chem

    What CH3COONa concentration is required to prepare a buffer solution with a pH of 4.80 if [CH3COOH] = 0.150 M?
  10. biochemistry

    Calculate the pH of a solution made by adding 75.0 g of CH3COONa to 750 mL of 0.64 M CH3COOH. Ka for CH3COOH is 1.8 x 10-5.

More Similar Questions