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A buffer is prepared by adding 22.0 g of sodium acetate (CH3COONa) to 520 mL of...

A buffer is prepared by adding 22.0 g of sodium acetate (CH3COONa) to 520 mL of a 0.155 Macetic acid (CH3COOH) solution.

A)Determine the ph of the buffer.

B)Write the complete ionic equation for the reaction that occurs when a few drops of hydrochloric acid are added to the buffer.

C)Write the complete ionic equation for the reaction that occurs when a few drops of sodium hydroxide solution are added to the buffer.

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Homework Answers

Answer #1

pH = pKa + log [CH3COONa] / [CH3COOH]

pKa = 4.75

[CH3COONa] =(22 / 82) (1000 / 520) = 0.516 M

[CH3COOH] = 0.155 M

pH = 4.75 + log [0.516] / [0.155]

pH = 5.27

B) if we add HCl

CH3COONa + HCl ---------------> CH3COOH + NaCl

CH3COO-(aq) + Na+(aq) + H+(aq) + Cl-(aq) -----------> Na+(aq) +  Cl-(aq) + CH3COOH

C) if we add NaOH

CH3COOH + NaOH ---------> CH3COONa + H2O

CH3COO-(aq) +   H+(aq) + Na+(aq) + OH-(aq) -----------> H2O(l) + CH3COO-(aq) +   Na+(aq)

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