1) Which of the following aqueous solutions are good buffer
systems?
.
a. 0.29 M hydroiodic acid + 0.20 M sodium iodide .
b. 0.12 M barium hydroxide + 0.29 M barium chloride .
c. 0.14 M nitrous acid + 0.12 M potassium nitrite .
d. 0.34 M ammonium nitrate + 0.36 M ammonia .
e. 0.31 M hydrofluoric acid + 0.29 M potassium fluoride .
2)A solution contains 0.486 M
NH4I and 0.480 M
ammonia.
The pH of this solution is .
3)
An aqueous solution contains 0.26 M
ammonium nitrate.
One Liter of this solution could be converted into a buffer by the
addition of:
(Assume that the volume remains constant as each substance is
added.) Select one or more of the following
(A) 0.13 mol HI
(B) 0.064 mol Ba(OH)2
(C) 0.26 mol HI
(D) 0.25 mol Ba(NO3)2
( E) 0.25 mol NH3
4)
How many grams of solid potassium cyanide should be added to 0.500 L of a 0.188 M hydrocyanic acid solution to prepare a buffer with a pH of 10.000?
grams potassium cyanide = g
5) How many moles of sodium hydroxide would
have to be added to 125 mL of a
0.371 M hydrofluoric acid
solution, in order to prepare a buffer with a pH of
3.410?
1)
Which of the following aqueous solutions are good buffer systems
Answer :
c. 0.14 M nitrous acid + 0.12 M potassium nitrite .
d. 0.34 M ammonium nitrate + 0.36 M ammonia .
e. 0.31 M hydrofluoric acid + 0.29 M potassium fluoride .
2)
A solution contains 0.486 M
NH4I and 0.480 M
ammonia.
pH = pKa + log [conjugate base / acid]
= 9.26 + log [0.480 / 0.486]
pH = 9.255
3)
An aqueous solution contains 0.26 M
ammonium nitrate.
Answer :
(B) 0.064 mol Ba(OH)2
( E) 0.25 mol NH3
Buffer is formed by the combination of weak acid and its conjugate base or weak base and its conjugate acid.
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