Question

12. The reaction between 1.0 x 104 M crystal violet and 1.0 M NaOH was monitored with UV-Vis spectroscopy. The reaction can be considered as an elementary reaction. I C25H30N3+(aq) + OH-(aq)- C2sH310N3(aq) From the experiment after 1000 s the [CV+) decreased to 50% of the initial concentration. What is the time required to consume 90% of the crystal violet?! A) B) 3322 s 5336 s 1100 s 705 s 3001 s D) E)

Answer 1

reation follous fist order- Kintics The For a first order reaction, 0.693 ty = 11 K ty half lif/time required to tompete seff reacfion 1 1000 Sec K = Yate Conctant (see) linital Conc. leg a.303 and Conc. af timet t T

iniHal Conc. 2.303 and K = Conc. af timet 0.693 0.693 6.93 X 10 K = 16 1000 inihd Conc. = 100 f time 't' = ro ( 20Campletia) Cunc a-303 G.93 x 10 3-202 11 &-303 = 3333 Sec 6.92 x 10 43 Answer: (A) 3322 Sec