4. Using Fick's 2nd Law for Qualitative Reasoning. (30 pts, 20 + 10) A. For each of the four initial (t = 0) concentration profiles shown below, draw what you expect the profile to look like at t > 0, t2 >> ti, and t3 00. B. Explain what general mathematical solution(s) to Fick's 2nd Law you would use to model these systems, and why. a B Co L LE Co x C