Question
In: Chemistry
1) A buffer is prepared by mixing 152 mL of 0.452 M HCl and 0.495 L...
1) A buffer is prepared by mixing 152 mL of 0.452 M HCl and 0.495 L of 0.400 M sodium acetate.
a. What is the pH?
b. How many grams of KOH must be added to 0.500 L of the buffer to change the pH by 0.18 units?
2) A buffer is prepared by mixing 52.6 mL of 0.050 M sodium bicarbonate and 10.0 mL of 0.10 M NaOH.
a. What is the pH?
b. How many grams of HCl must be added to 25.0 mL of the buffer to change the pH by 0.07 units?
Solutions
Expert Solution
1 a)
Number of mmol of HCl 
Number of mmol of sodium acetate 
b)
0.5 L of buffer contains 
mmoles of acetic acid and 
mmol of sodium acetate. Let W mmol of KOH is added.
53-W mmol of acetic acid will remain uneutralised. 99.9+W mmol of acetate salt will be formed.
mmol
The molar mass of KOH is 56.11 g/mol
The mass of KOH 
queen_honey_blossom answered 3 years agoRelated Solutions
A buffer is prepared by mixing 206 mL of 0.452 M HCl and 0.470 L of...
A buffer is prepared by mixing 206 mL of 0.452 M HCl and 0.470 L
of 0.400 M sodium acetate. What is the pH? How many grams of KOH
must be added to 0.500 L of the buffer to change the pH by 0.16
units?
a. What is the pH of the buffer prepared by mixing 250. mL of 0.200 M...
a. What is the pH of the buffer prepared by mixing 250. mL of
0.200 M benzoic acid and 100. mL of 0.250M NaOH? pKa=4.19
b. A buffer containing 1.00 M concentrations of HOAc and NaOAc
has a pH of 4.742. (a) What is the pH of the soln’ after 0.0100 mol
of HCl has been added to 1.00 L of the buffer? (b) What is the pH
of the soln’ after the addition of 0.0100 mol of NaOH? (c)...
A buffer is prepared by mixing 25.0 mL of 0.500 M NH3(aq) with 25.0 mL of...
A buffer is prepared by mixing 25.0 mL of 0.500 M
NH3(aq) with 25.0 mL of 0.200 M HCl (aq). What is the pH
of the buffer? [ Kb (NH3) = 1.8 x
10-5 ]
A buffer solution was prepared by mixing 300.0 mL of a 0.200 M solution of hydroxylamine...
A buffer solution was prepared by mixing 300.0 mL of a 0.200 M
solution of hydroxylamine (OHNH2, Kb = 1.1 × 10-8) and 250.0 mL of
a 0.300 M solution of its hydrochloride salt (OHNH3+ Cl- ).
Calculate the pH of the solution after the addition of 1.08 g of
solid NaOH (molar mass = 40.00 g/mol). Assume that there is no
volume change upon the addition of solid.
What is the pH of a buffer prepared by mixing 20.00 mL of 0.0300 M ammonium...
What is the pH of a buffer prepared by mixing 20.00 mL of 0.0300
M ammonium chloride with 40.00 mL of 0.0450 M ammonia? What is the
resulting pH if 1.00 mL of 0.10 M HCl is added to this
solution?
A buffer solution was prepared by mixing 300.0 mL of a 0.200 M solution of hydroxylamine...
A buffer solution was prepared by mixing 300.0 mL of a 0.200 M
solution of hydroxylamine (OHNH2, Kb = 1.1 ×
10-8) and 250.0 mL of a 0.300 M solution of its
hydrochloride salt (OHNH3+ Cl- ).
Calculate the pH of the solution after the addition of 1.08 g of
solid NaOH (molar mass = 40.00 g/mol). Assume that there is no
volume change upon the addition of solid.
A.
8.22
B.
5.55
C.
6.30
D.
5.78
1. Determine the pH of the buffer solution that is prepared by mixing 259 mL of...
1. Determine the pH of the buffer solution that is prepared by
mixing 259 mL of 0.0983 M BIS−TRIS propane−H (C11H27N2O6+ ) to 855
mL of 0.0729 M BIS-TRIS_propane (C11H26N2O6) ). Assume the 5%
approximation is valid. Report your answer to 2 decimal places. The
pKa of BIS−TRIS propane−H is 9.10. Submit Answer Tries 0/3 2.
Determine the pH of the BIS−TRIS propane−H/BIS−TRIS propane buffer
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A buffer solution was prepared by mixing 516.9 mL of 0.25 M acetic acid and 103.8...
A buffer solution was prepared by mixing 516.9 mL of 0.25 M
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Answer in 2 decimal places.
Suppose 50.00 mL of 0.300 M HCl is added to an acetate buffer prepared by dissolving...
Suppose 50.00 mL of 0.300 M HCl is added to an acetate
buffer prepared by dissolving 0.100 mol of acetic acid and 0.110
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and final pH values? What would be the pH if the same amount of HCl
solution were added to 170 mL of pure water?
Suppose 10.00 mL of 0.200 M HCl is added to an acetate buffer prepared by dissolving...
Suppose 10.00 mL of 0.200 M HCl is added to an acetate buffer
prepared by dissolving 0.100 mol of acetic acid and 0.110 mol of
sodium acetate in 0.100 L of solution. What are the initial and
final pH values? What would be the pH if the same amount of HCl
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=
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