●●● ●●●● ●●●●● 4. Experimental procedures ●●●● ●●●●● ●●●● Drain the distilled after the maximum differential pressure has been measured. Wash the external case and the capillary tube once with butanol with the concentration of 0. 002molL Then add the solution and measure its maximum differential pressure just like the distilled water. Measure the maximum differential pressure of the butanol solution with the concentration of 0.05,0.10,0.15,0.20,0.25,0.30,0.35mol/L. .(Note: every time the solution is changed, we should use the Pending liquid to wash the external case and the capillary tube) (5)Record the experimental temperature4.Experimental procedures ⚫ (4)Drain the distilled after the maximum differential pressure has been measured.Wash the external case and the capillary tube once with butanol with the concentration of 0.002mol/L.Then add the solution and measure its maximum differential pressure just like the distilled water.Measure the maximum differential pressure of the butanol solution with the concentration of 0.05,0.10,0.15,0.20,0.25,0.30,0.35mol/L . ⚫ (Note: every time the solution is changed, we should use the Pending liquid to wash the external case and the capillary tube) (5) Record the experimental temperature