mixture of CH3COOH and CH3COONa act as acidic buffer
for such buffers
pH = pKa + log [CH3COONa] / [CH3COOH]
pH = 5.0
pka = - log Ka = - log 1.76 x 10-5 = 4.75
[CH3COOH] = (1.2 / 60.05) (1000 / 500) = 0.040 M
[CH3COONa] = ?
5.0 = 4.75 + log [COONa] / [0.040]
0.25 = log [CH3COONa] + 1.40
log [CH3COONa] = -1.15
[CH3COONa] = 0.071 M.
0.071 = (W / 82.03) (1000 / 500)
0.0355 = W / 82.03
W = 2.91 g
mass of CH3COONa = 2.91 g
what mass of sodium acetate, NaCH3COO, do we need to add to a 500 mL solution that contains 1.2g of acetic acid, CH3COO...
6. What mass of sodium acetate (NaCH3COO) should be dissolved in 250.0 mL of 0.30 M acetic acid (CH3COOH) to form a buffer of pH 5.0? [Ka for acetic acid is 1.8 × 10−5 ] (a) 11 g (b) 8.0 g (c) 7.5 g (d) 5.0 g (e) 1.4 g
Calculate the pH of a solution made by adding 42 g of sodium acetate, NaCH3COO, to 22 g of acetic acid, CH3COOH, and dissolving in water to make 300. mL of solution. Hint given in feedback. The K, for CH3COOH is 1.8 x 10-5 M. As usual, report pH to 2 decimal places. Answer: Calculate the pH of a solution made by adding 59 g of sodium acetate, NaCH3COO, to 22 g of acetic acid, CH3COOH, and dissolving in water...
Calculate the pH of a 0.50 M solution of sodium acetate (NaCH3COO) given that the Ka of acetic acid (CH3COOH) is 1.8 x 105, A 9.26 B.9.22 11.48 D.4.78 E. 2.52
Calculate the pH of a solution made by adding 59 g of sodium acetate, NaCH3COO, to 22 g of acetic acid, CH COOH, and dissolving in water to make 500. mL of solution. Answer:
Calculate the pH of a 0.575 M of sodium acetate (NaCH3COO). Ka for acetic acid is 1.8 × 10-5.
Calculate the pH of a 0.40 M solution of sodium acetate (NaCH3COO) given that the Ka of acetic acid (CH3COOH) is 1.8 x 10 5. Ο Α. 2.57 Ο Ο Β. 9.17 Ο C.9.26 Ο Ο D. 4.83 Ο Ο Ε. 11.43
A buffer solution that is 0.10 M sodium acetate and 0.20 M acetic acid is prepared. Calculate the initial pH of this solution The K, for CH3COOH is 1.8 x 10-5 M. As usual, report pH to 2 decimal places. Answer: A buffered solution resists a change in pH. Calculate the pH when 21.2 mL of 0.031 M HCl is added to 100.0 mL of the above buffer. Answer:
For a buffer made from sodium acetate and acetic acid, the Ka of acetic acid is 1.8E-5. What mass of sodium acetate (NaCH3CO2) must be added to 2.50 L of 0.68 M acetic acid to make a buffer solution with pH = 5.75? The answer should be in two significant figures.
a buffer solution of pH =5.30 can be prepared by dissolving acetic acid and sodium acetate in water. How many moles of sodium acetate must be added to 1 L of 0.25 M acetic acid to prepare the buffer? Ka(CH3COOH)=1.8 x 10^-5
" Determine the amount of sodium acetate needed to prepare 50.0 mL of acetic acid/sodium acetate buffer having a H of 5.0 using approximately 0.100 M acetic acid. Check the concentration of the acetic acid in the laboratory and use this exact concentration for your calculation. For acetic acid Ka= 1.8 x 105." The answer is 0.75g NaC2H3O2. But I need to show the equation steps. Any help?