Select all of the following solutions that would form a buffer when they were mi

Question

Select all of the following solutions that would form a buffer when they were mixed.

1. A solution that is formed when 0.23 moles of CH3CH2COOH is mixed with 0.49 moles of NaOH. Assume the final volume is 1.0 L.
2. A solution that is formed when 0.33 moles of NH3 is mixed with 0.12 moles of NaOH. Assume the final volume is 1.0 L.
3. A solution that is formed when 0.82 moles of NH3 is mixed with 0.24 moles of HBr. Assume the final volume is 1.0 L.
4. A solution that is formed when 0.52 moles of NaNO2 is mixed with 0.24 moles of HCl. Assume the final volume is 1.0 L.
5. A solution that is formed when 0.33 moles of NaF is mixed with 0.39 moles of HCl. Assume the final volume is 1.0 L.

Explanation / Answer

Acid buffer solution; it is a mixture of weak acid and it's salt with strong base

CH3CH2COOH + CH3CH2COONa

Basic buffer solution: it is a mixture of weak base and it's salt with strong acid.

NH3 + NH4Br

1. A solution that is formed when 0.23 moles of CH3CH2COOH is mixed with 0.49 moles of NaOH. Assume the final volume is 1.0 L.

3. A solution that is formed when 0.82 moles of NH3 is mixed with 0.24 moles of HBr. Assume the final volume is 1.0 L.

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