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Table: buffering capacity of various solutions solution initial pH pH after adding acid water 4.9 2.2 0.1m NaCl 4.8 2.5 skim milk 6.4 5.0 0.1

Table: buffering capacity of various solutions

solution initial pH pH after adding acid

water 4.9 2.2

0.1m NaCl 4.8 2.5

skim milk 6.4 5.0

0.1 M phosphate buffer 6.4 6.2

1. What is the most effective buffer?

2. What is the least effective buffer?

3. What accounts for the different buffering capacities of these solutions?

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