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Which of the following aqueous solutions are good buffer systems? Which of the following aqueous solutions...

Which of the following aqueous solutions are good buffer systems?

Which of the following aqueous solutions are good buffer systems?
.

0.29 M nitric acid + 0.21 M potassium nitrate
.
0.16 M nitrous acid + 0.13 M potassium nitrite
.
0.30 M acetic acid + 0.23 M sodium acetate
.
0.31 M ammonium bromide + 0.33 M ammonia
.
0.15 M calcium hydroxide + 0.24 M calcium chloride
.
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