Which of the following aqueous solutions are good buffer
systems?
.
0.12 M hydrofluoric
acid + 0.17 M potassium fluoride
0.33 M ammonium bromide + 0.30 M ammonia
0.36 M nitrous
acid + 0.24 M sodium nitrite
0.18 M sodium acetate + 0.21 M acetic
acid
0.22 M perchloric
acid + 0.21 M sodium perchlorate
--------
Which of the following aqueous solutions are good buffer
systems?
.
0.23 M hydrochloric
acid + 0.19 M potassium chloride.
0.12 M hydrocyanic
acid + 0.20 M perchloric
acid.
0.12 M sodium
hydroxide + 0.27 M sodium bromide.
0.31 M barium
chloride + 0.27 M calcium
chloride.
0.33 M ammonia + 0.36 M ammonium bromide.
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A 1 liter solution
contains 0.433 M nitrous
acid and 0.577 M potassium
nitrite.
Addition of 0.108 moles
of calcium hydroxide will:
(Assume that the volume does not change upon the addition
of calcium hydroxide.)
Raise the pH slightly
Lower the pH slightly
Raise the pH by several units
Lower the pH by several units
Not change the pH
Exceed the buffer capacity
------
A 1 liter solution
contains 0.518 M nitrous
acid and 0.389 M potassium
nitrite.
Addition of 0.427 moles
of hydrochloric acid will:
(Assume that the volume does not change upon the addition
of hydrochloric acid.)
Raise the pH slightly
Lower the pH slightly
Raise the pH by several units
Lower the pH by several units
Not change the pH
Exceed the buffer capacity