at room temperature is caffeine soluble in water or dichloromethane
http://www.laar.uns.edu.ar/indexes/artic_v4003/Vol40_3_283.pdf
To determine the solubility of caffeine at room temperature, we can follow a scientific approach.
1. Research the properties of caffeine: Caffeine is a bitter, white crystalline alkaloid. It is commonly found in coffee, tea, and energy drinks. It is also known to be soluble in water due to its polar nature.
2. Understand the solvents in question: Water is a polar solvent and is commonly used to dissolve polar substances. Dichloromethane (also known as methylene chloride) is an organic solvent and is generally less polar than water.
3. Apply the rule "like dissolves like": The solubility of a substance is often determined by the nature of the solvent. Polar solvents like water tend to dissolve polar solutes, while nonpolar solvents like dichloromethane dissolve nonpolar solutes.
Based on this information, we can conclude that caffeine is soluble in water because both caffeine and water are polar substances. On the other hand, dichloromethane is a nonpolar solvent, and caffeine is a polar substance, so it is expected that caffeine will have limited to no solubility in dichloromethane.
In summary, caffeine is soluble in water but not soluble in dichloromethane at room temperature.