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Which of the following aqueous solutions are buffer solutions? (Select all that apply.) 0.18 M Ca(OH)2...

Which of the following aqueous solutions are buffer solutions?

(Select all that apply.)

0.18 M Ca(OH)2 + 0.27 M CaCl2

0.26 M NH4NO3 + 0.33 M NH3

0.13 M CH3COOH + 0.22 M CH3COONa

0.27 M HNO3 + 0.24 M NaNO3

0.34 M HCN + 0.21 M KCN

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Answer #1

A buffer solution consists of a

weak acid + its conjugate base,

or

weak base + its conjugate acid.

Let's consider the options

1)

0.18 M Ca(OH)2 + 0.27 M CaCl2

Ca(OH)2 is a strong base so it

does not form a buffer solution

2)

0.26 M NH4NO3 + 0.33 M NH3

NH3 is a weak base and NH4NO3 is its conjugate acid so

it forms a buffer solution

3)

0.13 M CH3COOH + 0.22 M CH3COONa

CH3COOH is a weak acid and CH3COONa is its conjugate base so

it forms a buffer solution

4)

0.27 M HNO3 + 0.24 M NaNO3

HNO3 is a strong acid so it

does not form a buffer solution

5)

0.34 M HCN + 0.21 M KCN

HCN is a weak acid and KCN is its conjugate base so

it forms a buffer solution

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