Calculate the concentration of hydronium ions [H_O^-] of vinegar from the measur

Question

Calculate the concentration of hydronium ions [H_O^-] of vinegar from the measured pH values. Express your answer in two significant figures. Show your all work. Concentration of [H_2O^-]: Using the initial concentration of CH_2COOH (from Problem 2) and the equilibrium concentration of H_2O^- calculated (from Problem 3). complete the reaction table for vinegar. Then, calculate the acidity constant. Show your work. Using the concentration at equilibrium in the table above, calculate the acidity constant (k_b) of acetic acid.

Explanation / Answer

Q4.

Acetic acid and... H3O+

species CH3COOH H2O CH3COO- H3O+

initially 0.83 NA 0 0

change - x NA +x +x

equilibrium 0.83-x NA x x

so

Ka = [H+][CH3COO-]/[CH3COOH]

turns

Ka = (x*x)/(0.83-x)

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