Question

In: Chemistry

What is the pH of a buffer containing 20.53g benzoic acid and 17.23g sodium benzoate in...

What is the pH of a buffer containing 20.53g benzoic acid and 17.23g sodium benzoate in 500mL of solution?

Solutions

Expert Solution

Molarity of benzoic acid = (mass/molarmass)*(1000/V in mL)

                                       = (20.53/122)*(1000/500)

                                     = 0.336

Molarity of sodium benzoate = (17.23/144)*(1000/500)

                                              = 0.239

pH = pKa + log(salt/acid)

     = 4.20 + log(0.239/0.336)

     = 4.05

queen_honey_blossom answered 2 years ago
Next > < Previous

Related Solutions

What should the molar concentrations of benzoic acid and sodium benzoate be in a solution that...
What should the molar concentrations of benzoic acid and sodium benzoate be in a solution that is buffered at a pH of 4.58 and has a freezing point of -2.0 ∘C? (Assume complete dissociation of sodium benzoate and a density of 1.01 g/mL for the solution.)
What should the molar concentrations of benzoic acid and sodium benzoate be in a solution that...
What should the molar concentrations of benzoic acid and sodium benzoate be in a solution that is buffered at a pH of 4.78 and has a freezing point of -2.0 ∘C? (Assume complete dissociation of sodium benzoate and a density of 1.01 g/mL for the solution.)
What should the molar concentrations of benzoic acid and sodium benzoate be in a solution that...
What should the molar concentrations of benzoic acid and sodium benzoate be in a solution that is buffered at a pH of 4.78 and has a freezing point of -2.0 ∘C? (Assume complete dissociation of sodium benzoate and a density of 1.01 g/mL for the solution.) Express your answers using two significant figures separated by a comma. answer is not 0.11 and 0.44 answer is not 0.11 and 0.45 answer is not 0.11 and 0.46 Textbook says Tf is 1.86...
What should the molar concentrations of benzoic acid and sodium benzoate be in a solution that...
What should the molar concentrations of benzoic acid and sodium benzoate be in a solution that is buffered at a pH of 4.86 and has a freezing point of -2.0 ∘ C ? (Assume complete dissociation of sodium benzoate and a density of 1.01 g/mL for the solution.)
Benzoic acid is a weak acid that has antimicrobial properties. Its sodium salt, sodium benzoate, is...
Benzoic acid is a weak acid that has antimicrobial properties. Its sodium salt, sodium benzoate, is a preservative found in foods, medications, and personal hygiene products. Benzoic acid ionizes in water: C6H5COOH⇌C6H5COO−+H+ The pKa of this reaction is 4.2. In a 0.57 M solution of benzoic acid, what percentage of the molecules are ionized? Express your answer to two significant figures and include the appropriate units.
Calculate the pH in 0.050 M sodium benzoate; Ka for benzoic acid (C6H5CO2H) is 6.5×10−5.
Calculate the pH in 0.050 M sodium benzoate; Ka for benzoic acid (C6H5CO2H) is 6.5×10−5.
Calculate the pH of a 0.01 M solution of sodium benzoate. A: Dissociation constant of benzoic...
Calculate the pH of a 0.01 M solution of sodium benzoate. A: Dissociation constant of benzoic acid. B: Calculate the hydrolysis constant of sodium benzoate. C: Calculate the pH of the 0.01 M solution.
A buffer solution is prepared by dissolving 1.50 g each of sodium benzoate, C6H5COONa, and benzoic...
A buffer solution is prepared by dissolving 1.50 g each of sodium benzoate, C6H5COONa, and benzoic acid, C6H5COOH (Ka = 6.45 × 10-5), in 150.0 mL of solution. The molar mass of benzoic acid is 122.12 g/mol and that of sodium benzoate is 144.10 g/mol. a) What is the pH of this buffer solution? b) Which buffer component must be added to change the pH to 4.00? What mass of that component is required? c) What volume of 2.0 M...
The Ka of benzoic acid (C6H5COOH) is 6.45 x 10-5 . Sodium benzoate (NaC6H5COO) is a...
The Ka of benzoic acid (C6H5COOH) is 6.45 x 10-5 . Sodium benzoate (NaC6H5COO) is a common food preservative. If you dissolve 0.100 grams of sodium benzoate into 100.0 mL of water, what will be the pH of this solution?
A buffer with a pH of 4.06 contains 0.13 M of sodium benzoate and 0.18 M...
A buffer with a pH of 4.06 contains 0.13 M of sodium benzoate and 0.18 M of benzoic acid. What is the concentration of [H ] in the solution after the addition of 0.052 mol of HCl to a final volume of 1.3 L? Assume that any contribution of HCl to the volume is negligible.
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT