Would you expect the densities of various fruit juices to all be the same? elaborate/explain your reason

No because some are more acidic then others  take apple juice and orange juice for instance.  Apple juice isn't thick and is see through unlike orange juice which is cloudy and sometimes has pulp which both would back the densities different but grape juice is more dense then all if you were to pul grape juice apple juice and orang juice in a bottle it would separate and the grape would stay at the bottom them orange finishing with apple