50. From a volumetric flask with a capacity of 100 ml, 15 ml of CH3COOH solution were taken for titration. During the titration of the sample, 0.1 n. NaOH solution gave the following results:
V(NaOH), ml 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0
R, Ohm 750 625 494 414 349 271 192 71 31
æ•10–3, S/m 1.33 1.6 2.0 2.4 2.9 3.7 5.2 14.0 32.3
Determine the mass (g) of acetic acid.

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