Calculate the pzn of a solution prepared by mixing 25.0 ml of 0.0100 m edta with 50.0 ml of 0.00500 m zn2*. assume that both the zn2* and edta solutions are buffered with 0.100 m nh3 and 0.176 m nh2c1

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.

what is the question here. i think you messed up.