Acetic acid dissociates to give acetate ion, (its conjugate base) and hydrogen c

Question

Acetic acid dissociates to give acetate ion, (its conjugate base) and hydrogen cation as shown below: CH_3COOH_(aq) CH_3COO^-_(aq) + H^+_(aq) Calculate the equilibrium constant if the initial, pre-equilibrium concentration of acetic acid was 1.38 M, and the equilibrium concentration of cation is [H^+] = 4.90 Times 10^-3 M? (Note that this is the same as pH = 2.31.) 1.75 Times 10^-5 5.71 Times 10^4 6.76 Times 10^-3 3.55 Times 10^-3 3.56 Times 10^-3 A protein solution was diluted by mixing 5.00 ml with 10.00 mL of water. The Ab_280 of the diluted solution was 0.85. What was the concentration of the original, undiluted solution? (Assume epsilon_280 = 10.24 M^-1 I^-1, and I = 1.00 cm) 2.55 M 0.25 M 0.17 M 0.083 M 0.028M

Explanation / Answer

5. [H+] = 10^-2.31 = 1.38*X

X = 0.0035 M

Ka = cx^2

   = 0.0035^2*1.38

   = 1.7*10^-5

answer: A

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