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To determine the concentration of CH3COOH in a vinegar sample (density 1.06 g/mL) firstly 25 ml vinegar diluted to 250 mL with water. Then, 40

To determine the concentration of CH3COOH in a vinegar sample (density 1.06 g/mL) firstly 25 ml vinegar diluted to 250 mL with water. Then, 40 ml of diluted solution is titrated with 0.12 M NaOH solution and 15.5 mL of NaOH are required to reach the stoichiometric phelonphtalein end point. What is the % (w/w) CH3COOH in this vinegar sample?

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