When should you load your concentrated pigment solution onto your column in column chromatography? Options:   When you still have a few centimeters of eluent on top of the sand layer.   When the eluent is just level with the sand layer.   As soon as you can, as it will decompose quickly in the light.   When the eluent has all dripped out of the column.

Determine the order of inhibition time of hexane, hexanol and benzene compounds in the reverse phase liquid chromatography column.

How GC retention time can be affected by the mobile phase flow rate and the temperature of the column

QUESTION 15 To improve the accuracy of our linear fit between absorbance and concentration, a. add an extra data point to your linear regression where you make the assumption that pure water has an absorbance of zero. b. make sure that you choose a "Linear Regression" curve fit. c. ensure that there are no air bubbles in the cuvette. O d. use the data points only at the lower end of the concentration range because Beer's Law is not applicable for higher concentrations. QUESTION 16 What laboratory equipment do you need to prepare a 0.250 M stock solution of NaCI? O a. buret, graduated cylinder, analytical balance b. beaker, volumetric flask O. volumetric pipet, analytical balance d. analytical balance, volumetric flask