An extraction procedure specifies that an aqueous solution containing dissolved organic material be extracted twice with 10-ml portions of diethyl ether. a student removes the lower layer after the first extraction and adds the second 10-ml portion of ether to the upper layer remaining in the separatory funnel. after shaking the funnel, the student observes only one liquid phase with no interface. explain.

Which of the following units is not an official si unit? mole liter kilogram ampere

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

The small bags of silica gel you often see in a new shoe box are placed there to control humidity. despite its name, silica gel is a solid. it is a chemically inert, highly porous, amorphous form of sio2. because water vapor readily adsorbs onto the surface of silica gel, it acts as a desiccant. despite not knowing mechanistic details of the adsorption of water onto silica gel, from the information provided you should be able to make an educated guess about the thermodynamic characteristics of the process. predict the signs for δg, δh, and δs for the adsorption of water.