Posted by janie on Friday, October 29, 2010 at 3:16pm.
A buffer is a solution of
a. a weak acid and its base (salt).
b. a weak base and its acid(salt).
Acetic acid/sodium acetate
NH3 and NH4Cl
A. 50 mL of 0.05M sodium hydroxide and 50 mL of 0.1M nitrous acid
For example, your first problem.
First, write the equation, then set up an ICE chart.
NaOH + HNO2 ==> NaNO2 + H2O
2.5....5.0...... 0.......0 initial
-2.5...-2.5......+2.5....+2.5 change
0......2.5.......2.5.....2.5 final
The table with the equation comes from the following data:
mmoles NaOH = 50 x 0.05 = 2.5 mmoles.
mmoles HNO2 = 50 x 0.1 = 5 mmoles.
From the final solution, you can see you have some HNO2 and its salt; that is a weak acid and its salt. Therefore, this is a buffered solution.
abcd
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