A buffer is prepared by adding 18.0 g of sodium acetate (CH_3 COON_a) to 490 mL
ID: 998021 • Letter: A
Question
A buffer is prepared by adding 18.0 g of sodium acetate (CH_3 COON_a) to 490 mL of a 0.160 M acetic acid (CH_3 COOH) solution. Determine the pH of the buffer. Express your answer using two decimal places. Write the complete ionic equation for the reaction that occurs when a few drops of hydrochloric acid are added to the buffer. Express your answer as a chemical equation. Identity all of the phases in your answer. Write the complete ionic equation for the reaction that occurs when a few drops of sodium hydroxide solution are added to a buffer Express your answer as a chemical equation. Identify all of the phases in your answer.Explanation / Answer
moles sodium acetate = 18 / 82.03 g/mol=0.219
concentration acetate = 0.219/ 0.450 L=0.487 M
pKa = 4.74
pH = 4.74 + log 0.487/ 0.160= 5.22
part b
HCl + CH3COONa ====> CH3COOH + NaCl
Complete Ionic: H+ + Cl- + CH3COO- + Na+ =====> CH3COOH + Na+ + Cl-
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