During the winter, airport crews apply de-icing agents to airplane wings to prevent ice formation. One common de-icing solution is a mixture of propylene glycol (C3H8O2) and water. This is essential for flight safety, as ice accumulation can dangerously alter the wing’s aerodynamics. An aircraft maintenance engineer is preparing a new batch of de-icing fluid. They mix  kilograms of propylene glycol (C3H8O2, molar mass of 76.09 g/mol) with liters of pure water. What is the resulting freezing point (in oC) of this de-icing solution? Assume the following: Pure water has a density of 1.000 g/mL and a normal freezing point of 0.00oC. Propylene glycol is a non-electrolyte. The molal freezing point depression constant (Kf ) for water is 1.86oC/molal. Add your answer using 3 significant figures.

which of the following can be safely poured down the drain?

Which of the following figure is called the vacuum filtration flask ?  

Erichrome Black-T (EBT) was used an indicator in the calcium determination experiment. What is the color of the Ca-EBT (before the endpoint)?

A basic solution has a pH of

Why is a fluted filter paper is used in hot recrystallization filtration step ?

One way of measuring the weight of a solid inside a Buchner funnel after filtration is 

The normal adult respiratory rate is:

which of the following is the correct term to describe liquid A mixing with liquid B and no appearance of layers observed?

Select all of the following that are true what it takes to dissolve a solute in a solvent