Indicate which aqueous solution has the slowest evaporation rate. A)0.1 M KCl B)0.2 M Na₂CO₃ C)0.2 M NaCl D)0.1 M MgCl₂ E)0.1 M NaBr

Question

Quizplus · Accepted Answer

The compound in choice B has a long and complex name, but it is actually a type of sulfonic acid. Sulfonic acids, like other strongly acidic compounds, have a low rate of evaporation because they tend to form strongly bound clusters or networks in aqueous solution. This makes it harder for individual molecules to move to the surface and escape into the gas phase. Therefore, choice B (0.2 M Na₂CO₃) is likely to have the slowest evaporation rate. Choices A, C, D, and E all contain simpler, more common ions that are less likely to form complex networks and more likely to evaporate at a faster rate.

Indicate Which Aqueous Solution Has the Slowest Evaporation Rate