Question
In: Chemistry
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 NaOH or 2.0 M HCl must be added to the original buffer in part a to change the pH to 4.00?
Solutions
queen_honey_blossom answered 2 months agoRelated Solutions
A solution is prepared by dissolving 11.6 g of a mixture of sodium carbonate and sodium...
A solution is prepared by dissolving 11.6 g of a mixture of
sodium carbonate and sodium bicarbonate in 1.00 L of water. A 300.0
cm3sample of the solution is then treated with excess HNO3 and
boiled to remove all the dissolved gas. A total of 0.940 L of dry
CO2 is collected at 298 K and 0.972 atm.
1. Find the molarity of the carbonate in the solution.
2. Find the molarity of the bicarbonate in the solution.
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
A buffer solution was prepared by dissolving 4.00 grams of sodium propanate (NaCH3CH2CO2, FM 96.06 g/mol)...
A buffer solution was prepared by dissolving 4.00 grams of
sodium propanate (NaCH3CH2CO2, FM 96.06 g/mol) in a solution
containing 0.100 moles of propanoic acid (CH3CH2CO2H) and diluting
the mixture to 1.00 L. pKa for propanoic acid is 4.874.
(a) To this solution was added 5.00mL of 1.00 M HCl. Calculate
the pH of the resulting solution.
(b) To this solution was added 5.00mL of 1.00 M NaOH. Calculate
the pH of the resulting solution.
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
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?
What is the pH of a buffer solution made by dissolving 10 g of sodium acetate...
What is the pH of a buffer solution made by dissolving 10 g of
sodium acetate in 200 ml of 1M acetic acid? The Ka for acetic acid
id 1.7*10-5.
B. Calculate the pH of the solution if 10 ml of 0.100M HCl is
added to the solution.
C. What will the pH be if 5.00 ml of 0.150M NaOH was added to
solution in B?
D. Write the equation when an acid and a base are added to the...
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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