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 2 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?
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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
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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
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volume change upon the addition of solid.
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8.22
B.
5.55
C.
6.30
D.
5.78
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=
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