Question

In: Chemistry

calculate the ph of a mixture of 0.26M acetic acid (pKa 4.76) and 0.23 M sodium...

calculate the ph of a mixture of 0.26M acetic acid (pKa 4.76) and 0.23 M sodium acetate.

Expert Solution

CH3COONa(aq) -----------------------> CH3COO^- (aq) + Na^+(aq)

0.23 M 0.23M

PKa = 4.76

-logKa = 4.76

Ka = 10^-4.76 = 1.74*10^-5

Kb = Kw/Ka

= 1*10^-14/1.74*10^-5 = 5.75*10^-10

CH3COO^- + H2O -----------------> CH3COOH + OH^-

I 0.23 0 0

C -x +x +x

E 0.23-x +x +x

Kb = [CH3COOH][OH^-]/[CH3COO^-]

5.75*10^-10 = x*x/(0.23-x)

5.75*10^-10 *(0.23-x) = x^2

x = 1.15*10^-5

[OH-] = x = 1.15*10^-5M

POH = -log[OH-]

= -log1.15*10^-5

= 4.9393

PH = 14-POH

= 14-4.9393 = 9.0607

queen_honey_blossom answered 1 year ago

pH calculations, pKa of acetic acid = 4.76. A mixture of 100mL of 0.10 M acetic...

pH calculations, pKa of acetic acid = 4.76. A mixture of 100mL of 0.10 M acetic acid with 100mL of 0.05M NaOH

What volumes of 0.1 M acetic acid, pKa 4.76, and 0.1 M sodium acetate are required...

What volumes of 0.1 M acetic acid, pKa 4.76, and 0.1 M sodium acetate are required to make 1 L of acetate buffer, pH 5.30? 776 mL acetate, 224 mL acetic acid 351 mL acetate, 649 mL acetic acid 540 mL acetate, 460 mL acetic acid 712 mL acetate, 288 mL acetic acid

A solution contains 1.5M sodium acetate. The pKa of acetic acid (a weak acid) is 4.76....

A solution contains 1.5M sodium acetate. The pKa of acetic acid (a weak acid) is 4.76. Calculate the fraction and percentage of the molecules existing in the unionized state.

Calculate the pH of a mixture that contains 0.23 M of HCOOH and 0.20 M of...

Calculate the pH of a mixture that contains 0.23 M of HCOOH and 0.20 M of HC6H5O. The Ka of HCOOH is 1.8

Calculate the pH of 0.305 L of a 0.17 M acetic acid - 0.28 M sodium...

Calculate the pH of 0.305 L of a 0.17 M acetic acid - 0.28 M sodium acetate buffer before (pH1) and after (pH2) the addition of 0.0062 mol of HBr. Assume that the volume remains constant. (Ka of acetic acid is 1.8⋅10−5) Express your answers using three significant figures separated by commas.

Calculate the pH of a solution of 0.25 M Acetic acid and 0.34M Sodium acetate before...

Calculate the pH of a solution of 0.25 M Acetic acid and 0.34M Sodium acetate before and after 0.036 M NaOH is added to the solution. Ka of HAc = 1.8 x 10 -5 Please Use the ICE method

Calculate the pH of a 0.100 M sodium benzoate, NaC6H5CO2, solution. The Ka of acetic acid...

Calculate the pH of a 0.100 M sodium benzoate, NaC6H5CO2, solution. The Ka of acetic acid is 6.3 x 10-5

1. Calculate the pH of the buffer of a solution of 0.02M acetic acid (pKa =...

1. Calculate the pH of the buffer of a solution of 0.02M acetic acid (pKa = 4.76) and 0.04 M acetate 2. Based on your answer to the previous question, how much of a 0.5 M solution of HCl must be added to 200 mL of the above mentioned solution to lower the pH to 2.50? Ignore volume changes.

Calculate the ionization constant of acetic acid: pH of 0.01 M acetic acid: 3.50 pH of...

Calculate the ionization constant of acetic acid: pH of 0.01 M acetic acid: 3.50 pH of 1.00 M acetic acid: 2.34

Calculate the pH of 0.10 M sodium acetate solution ( Ka, acetic acid = 1.76 x...

Calculate the pH of 0.10 M sodium acetate solution ( Ka, acetic acid = 1.76 x 10-5 ).