Question
In: Chemistry
A solution was prepared by weighing out 6.20 grams of sodium benzoate, NaC7H5O2 along with 2.25...
A solution was prepared by weighing out 6.20 grams of sodium benzoate, NaC7H5O2 along with 2.25 grams of benzoic acid, HC7H5O2, and was dissolved in 750.0 mL of water. What is the pH of this solution given that the Ka for benzoic acid is 6.61 X 10-5 .
Solutions
queen_honey_blossom answered 2 years agoRelated Solutions
a 500.00 mL solution is prepared by dissoving 6.20 sodium acetate in water. the pKa of...
a 500.00 mL solution is prepared by dissoving 6.20 sodium
acetate in water. the pKa of the conjugate acid (acetic acid) is
4.75. Calculate the solution pH and the concentration of acetate
and acetic acid (in molarity mol/L). Use the molecular weight of
sodium acetate of 82.0 g/mol.
A 150.0-mL solution contains 2.25 g of sodium benzoate and 2.83 g of benzoic acid. Calculate...
A 150.0-mL solution contains 2.25 g of sodium benzoate and 2.83
g of benzoic acid. Calculate the pH of the solution. For benzoic
acid, Ka=6.5×10−5
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...
1 a. A buffer solution is prepared by placing 5.86 grams of sodium nitrite and 32.6...
1 a. A buffer solution is prepared by placing 5.86 grams of
sodium nitrite and 32.6 mL of a 4.90 M nitrous acid solution into a
500.0 mL volumetric flask and diluting to the calibration mark. If
12.47 mL of a 1.43 M solution of potassium hydroxide is added to
the buffer, what is the final pH? The Ka for nitrous
acid = 4.6 X 10-4.
1 b. A 0.892 liter buffer solution is prepared so that it is
0.430...
A buffer is constructed by dissolving 2.05 grams of sodium benzoate (144.11 g/mol) and 2.47 grams...
A buffer is constructed by dissolving 2.05 grams of sodium
benzoate (144.11 g/mol) and 2.47 grams of benzoic acid (122.12
g/mol Ka = 6.50 x 10^-5) in 150.0 mL of distilled
water. The solution is titrated with 0.500 M NaOH.
Calculate the pH of the solution:
a) at the equivalence point
b) 20.00 mL NaOH before the equivalence point
c) 20.00 mL NaOH after the equivalence point
What mass (in grams) of sodium benzoate must be added to 150.0 mL of a 0.14...
What mass (in grams) of sodium benzoate must be added to 150.0
mL of a 0.14 M benzoic acid solution in order to obtain a buffer
with a pH of 4.25? The molecular weight of sodium benzoate is
144.11g/mol. The Ka of benzoic acid is 6.46x10^-5. Be sure to
include proper units in your answer to two significant figures.
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.)
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