1. When titrating a sample containing acetic acid with a 0.1068 N solution of potassium hydroxide, the following data were obtained:
Titrant volume, ml 3.0 4.0 5.0 5.3 5.4 5.5 5.6 5.7 5.8 6.0 7.0 8.0 9.0
pH 3.1 3.3 3.6 4.0 4.4 4.8 5.5 9.6 10.2 10.7 11.0 11.3 11.4
Calculate the mass of acetic acid in the sample.

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