11. Calculate the surface tension of acetic acid at 20°C if the following data were obtained using the drop counting method: the number of drops of acetic acid is 44, the number of drops of water is 16. The density of acetic acid is 1.0491 g/ml, the density of water is 0.9982 g/ml . The surface tension of water at 20°C is 72.75 mJ/m2.

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