(a) Make a graph showing retention times of peaks 6, 7, and 8 in Figure 24-12 as a function of %acetonitrile (%B). Predict the retention time of peak 8 at 45% B.
(b) In Figure 24-12, tm = 2.7 min. Compute k for peaks 6, 7, and 8 as a function of %B. Make a graph of log k versus ɸ, where ɸ = %B/100. Find the equation of a straight line through a suitable linear range for peak 8. The slope is - S and the intercept is log kw. From the line, predict tr for peak 8 at 45% B and compare your answer with part (a).