In an experiment, 25 ml of 0.5 M CH3COOH was titrated against 0.5 M NaOH solution using phenolphthalein as indicator. The end point is reached when 25 mL of NaOH solution was added. i) Determine the concentration of the product.

ii) Determine the pH of the solution at the end point.

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.