3 on page 23 of the lab textbook: Does benzoic acid (pk_a 4.20) undergo a favora
ID: 985021 • Letter: 3
Question
3 on page 23 of the lab textbook: Does benzoic acid (pk_a 4.20) undergo a favorable acid-base reaction with water? With diethyl ether? Write equations for the reactions and show the direction of the equilibria. (To show the direction of the equilibria, you can calculate the value of k or pk for each acid-based reaction or just indicate whether equilibrium lies to the left or to the right.) Note: Benzoic acid is C_6H_5COOH. Diethyl ether is (C_2H_5)_2O. page 17 of textbook has pk_a's of water and ether.Explanation / Answer
C6H5COOH -----> C6H5COO- + H+
Pka of benzoic acid = 4.2
Pkw of water = 14
Pka of water = 7
C6H5COOH +H2O-----> C6H5COO- + H3O+
acid base
equilibrium shift to right side
C6H5COOH + (C2H5)2O -----> C9H10CO2 + C2H5OH
equlibrium shift to left side
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