The reaction of tert-butyl chloride, (CH3)3CCl, with azide ion takes place via the carbocation inter — Kinetics Chemistry Question

The reaction of tert-butyl chloride, (CH₃)₃CCl, with azide ion takes place via the carbocation intermediate (CH₃)³C⁺ as shown on the reaction coordinate diagram below. The reaction proceeds faster in solvents of high polarity (such as water) than in less polar solvents (such as ethanol). The solid line represents the reaction coordinate in 80% water/20% ethanol. Which dashed line best represents the reaction coordinate in 20% water/80% ethanol?