5. Give reaction equations for the quantitative determination of anesthesin (benzocaine) (Mr 165.19) by nitritometry. Indicate the color transition of the indicator tropeolin 00 in a mixture with methylene blue at the end of the titration. Calculate the molar mass of the equivalent, the titer for the analyte, the sample of anesthesin, so that 10.0 ml of 0.1 mol/l sodium nitrite solution (K = 0.98) is used for titration.

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