Explain why pbcl2 did not precipitate immediately on addition of hcl. (hint: what condition must be met by [pb2+] and [cl-] if pbcl2 is to form? )

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.