The information in the Titration of NaOH, HCl and Acetic Acid document is what should be placed in the poster. Just paraphrase the information.
Also it can be as may words as you like just as long as all the info is there and it is legible. Also use bright colours to make the poster catching to the eye.
the rubric is also there, just follow the guidlines
Examples of posters are also attached down below and you can use them as a guide.
It also does not have to be double spacing