1. Is the following reaction a redox reaction? If so, please use oxidation numbers to verify what is oxidized and what is reduced.

Zn(s) + 2 NO, (aq) + 4 H(aq) → Zn²+(aq) + 2 NO2(g) + 2 H2O(1)

Calculate the ph at the equivalence point for the titration of a solution containing 150.0 mg of ethylamine (c2h5nh2) with 0.1000 m hcl solution. the volume of the solution at the equivalence point is 250.0 ml. kb forethylamine is 4.7 × 10−4 .