Explain why the colligative properties may not apply to the solutions containing volatile solutes

Read these sentences from the text. near the equator, the tropics receive the most rain on a consistent basis. as a result, the fresh water falling into the ocean decrease the salinity of the surface water in that region. [. .] . . as the salt content of sea water increases, so does its density. what can you infer about how rain affects the density of surface water near the equator?

Can someone me with questions 12 and 13 plz.

An observation that requires measurement is called quantitative observable or qualitative