At one end of the tube, there is a large source of A at a concentration of 0.1 M.
At the other end of the tube there is an adsorbent material that quickly
absorbs any A, making the concentration 0 M. If D = 1.5 × 10−6
× 10−6
−1
s
/s and k = 5
cm2
, what is the concentration of A as a function of distance in the tube?