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Which buffer solution has the greatest buffer capacity? a) 0.40 mole/L acetic acid + 0.40 mole/L...

Which buffer solution has the greatest buffer capacity?

a) 0.40 mole/L acetic acid + 0.40 mole/L sodium acetate

b) 0.30 mole/L nitric acid + 0.30 mole/L sodium nitrate

c) 0.80 mole/L HCl + 0.80 mole/L sodium chloride

d) 0.50 mole/L acetic acid + 0.50 mole/L sodium acetate

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