Final answer:
Viscosity is the resistance of a liquid to flow and is measured in units of the poise. The viscosities of different liquids are influenced by intermolecular forces. The student's question likely relates to the relationship between the concentration of polystyrene and the viscosity of solutions in toluene.
Step-by-step explanation:
Viscosity is the resistance of a liquid to flow. It is measured in units of the poise (mPa.s), with higher numbers indicating higher viscosity. The viscosities of different liquids can vary depending on the intermolecular forces present. Strong intermolecular forces make it more difficult for molecules to move past one another, resulting in higher viscosity.
The student's specific question related to the viscosities of a series of solutions of polystyrene in toluene is not provided. However, from the information given, it can be understood that the student is studying the relationship between the concentration of polystyrene in toluene and the resulting viscosity of the solution. By measuring the relative viscosities of the solutions using an Ostwald viscometer, the student could analyze how the concentration of polystyrene affects the intermolecular forces and the resulting viscosity.