7. Calculate the molar concentration of nitric acid and phenol C6H5OH, if the following results were obtained during conductometric titration of 50 cm3 of their mixture with a solution of potassium hydroxide, (С(KOH)=0.500 mol/dm3):
VKOH, cm3 1 2 3 4 5 6 7 8 9 10 11 12
L, cm 19 17 15 13 12.5 12.6 12.7 12.8 13.0 14.0 15.0 16.0

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