If you are to prepare a 1.000 L of a 0.100 M buffer at pH 5.00...
- If you are to prepare a 1.000 L of a 0.100 M buffer at
pH 5.00 using the CH3COOH/
Na+CH3COO- buffer system
(pKa 4.76a), answer the following questions:
- What is the molar ratio of the base to acid at pH 5.0?
- The concentration of the buffer (0.100 M in this example) refers to the sum of the weak acid and its conjugate base. Given this information, what is the concentration of the weak acid and its conjugate base at pH 5.0?
- Given the volume (1.000 L) of the buffer, how many moles of the acetic acid and sodium acetate will you mix to dissolve in 1 L of water to prepare this buffer?
- If you are to start with the acetic acid only, how many moles of acetic acid do you need? How many moles of NaOH need to be added to the acetic acid to generate enough acetate to form the buffer of pH 5.0?
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1) Calculate the pH of the 1L buffer composed of 500 mL of 0.60 M acetic...
1) Calculate the pH of the 1L buffer composed of 500 mL of 0.60 M acetic acid plus 500 mL of 0.60 M sodium acetate, after 0.010 mol of HCl is added (Ka HC2H3O2 = 1.75 x 10-5). Report your answer to the hundredths place. 2) Calculate the pH of the 1L buffer composed of 500 mL 0.60 M acetic acid plus 500 mL of 0.60 M sodium acetate, after 0.010 mol of NaOH is added (Ka HC2H3O2 = 1.75...
You are asked to prepare 500. mL of a 0.100 M acetate buffer at pH 5.00 using only pure acetic acid (MW=60.05 g/mol,...
You are asked to prepare 500. mL of a 0.100 M acetate buffer at pH 5.00 using only pure acetic acid (MW=60.05 g/mol, pKa=4.76), 3.00 M NaOH, and water. Answer the following questions regarding the preparation of the buffer. 1. How many grams of acetic acid will you need to prepare the 500 mL buffer? Note that the given concentration of acetate refers to the concentration of all acetate species in solution. 2. What volume of 3.00 M NaOH must...
1. You need to prepare an acetate buffer of pH 5.93 from a 0.833 M acetic...
1. You need to prepare an acetate buffer of pH 5.93 from a 0.833 M acetic acid solution and a 2.56 M KOH solution. If you have 475 mL of the acetic acid solution, how many milliliters of the KOH solution do you need to add to make a buffer of pH 5.93? The pKa of acetic acid is 4.76. 2. If a buffer solution is 0.110 M in a weak acid (Ka = 1.6 × 10-5) and 0.570 M...
12. You are asked to prepare 500. mL of a 0.200 M acetate buffer at pH...
12. You are asked to prepare 500. mL of a 0.200 M acetate buffer at pH 4.90 using only pure acetic acid (MW=60.05 g/mol, pKa=4.76), 3.00 M NaOH, and water. Answer the following questions regarding the preparation of the buffer. a) How many grams of acetic acid will you need to prepare the 500 mL buffer? Note that the given concentration of acetate refers to the concentration of all acetate species in solution. g=? B) What volume of 3.00 M...
Sample Buffer Calculation: Given a pH of 5.4, prepare a buffer using one of the buffer...
Sample Buffer Calculation: Given a pH of 5.4, prepare a buffer using one of the buffer systems below: System A: 3.5M acetic Acid (MM=60.1) : sodium acetate, anhydrous (MM=82.0) pKa = 4.74 System B: Sodium phosphate, monobasic (NaH2PO4 x H2O) (MM=138.0) : Sodium phosphate, dibasic, Na2HPO4 (MM=142.0) pKa = 6.86 a) Choose the buffer system most effective at pH of 5.4 b) Calculate the amounts of weak acid and conjugate base you need to make 25mL of 0.25M solutions (one...
To understand how buffers use reserves of conjugate acid and conjugate base to counteract the effects...
To understand how buffers use reserves of conjugate acid and conjugate base to counteract the effects of acid or base addition on pH. A buffer is a mixture of a conjugate acid-base pair. In other words, it is a solution that contains a weak acid and its conjugate base, or a weak base and its conjugate acid. For example, an acetic acid buffer consists of acetic acid, CH3COOH, and its conjugate base, the acetate ion CH3COO−. Because ions cannot simply...
You need to prepare 900 mL of a 0.25 M acetate buffer solution with a pH...
You need to prepare 900 mL of a 0.25 M acetate buffer solution with a pH of 4.3 a. Determine the concentration of both the acetate (conjugate base) and acetic acid (weak acid) in this solution. b. If you made the solution above using solid sodium acetate and liquid acetic acid, what mass of sodium acetate is required and what volume of glacial acetic acid is required?
A) A beaker with 1.80×102 mL of an acetic acid buffer with a pH of 5.000...
A) A beaker with 1.80×102 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 5.50 mL of a 0.340 M HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.740. B)You need to produce a buffer solution that has a pH of 5.37. You already have a solution...
You are asked to prepare 500. mL 0.150 M acetate buffer at pH 5.00 using only...
You are asked to prepare 500. mL 0.150 M acetate buffer at pH 5.00 using only pure acetic acid (MW = 60.05 g/mol, pKa = 4.76), 3.00 M NaOH, and water. How many grams of acetic acid will be needed to prepare the 500. mL buffer? Note that the given concentration of acetat refers to the concentration of all acetate species in solution. mass: What volume of 3.00 M NaOH, must be added to the acetic acid to achieve a...
You need to prepare an acetate buffer of pH 6.29 from a 0.704 M acetic acid...
You need to prepare an acetate buffer of pH 6.29 from a 0.704 M
acetic acid solution and a 2.48 M KOH solution. If you have 575 mL
of the acetic acid solution, how many milliliters of the KOH
solution do you need to add to make a buffer of pH 6.29? The pKa of
acetic acid is 4.76.
You need to prepare an acetate buffer of pH 6.29 from a 0.704 M acetic acid solution and a 2.48 M...
You are asked to prepare 500. mL 0.150 M acetate buffer at pH 5.00 using only pure acetic acid (MW = 60.05 g/mol, pKa = 4.76), 3.00 M NaOH, and water. How many grams of acetic acid will be needed to prepare the 500. mL buffer? Note that the given concentration of acetat refers to the concentration of all acetate species in solution. mass: What volume of 3.00 M NaOH, must be added to the acetic acid to achieve a...
You need to prepare an acetate buffer of pH 6.29 from a 0.704 M
acetic acid solution and a 2.48 M KOH solution. If you have 575 mL
of the acetic acid solution, how many milliliters of the KOH
solution do you need to add to make a buffer of pH 6.29? The pKa of
acetic acid is 4.76.
You need to prepare an acetate buffer of pH 6.29 from a 0.704 M acetic acid solution and a 2.48 M...
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