Question

two liquid drying agents​

Answer 1

calcium hydride (CaH2), sodium metal (in combination with benzophenone) or lithium aluminum hydride (LiAlH4)

Answer 2

Two liquid drying agents ​calcium hydride ($CaH_2$) and sodium metal

Explanation:

• A drying agent is a chemical used to remove water from an organic compound that is in solution. In making or isolating chemical compounds they often become contaminated with water.
• Common drying agents are anhydrous inorganic salts that acquire waters of hydration when exposed to moist air or a wet solution. For the most common drying agents such as sodium sulfate or magnesium sulfate, the crystals form larger clumps when they absorb water.
• Depending on how much water remained in the solution, the solvent can boil if too much drying agent was added at once.
• This is particularly a problem for low boiling solvents like diethyl ether and dichloromethane, where one can often observe the formation of bubbles in the solution due to this problem.

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