There is a significant misconception in the video (at 3:25) which does limit the usability of this video. The presenter states that the "positive copper ions have reacted with the negative sulfate ions to form copper sulfate". That has NOT happened. The H+ ions from the acid have reacted with the base to form water and aqueous copper ions. The copper ions and sulfate ions are then just floating around. This video perpetuates a commonly held misconception that the copper ions and sulfate ions "join together" in solution when nothing of the sort happens. Hopefully you can fix in the next iteration.