Answer:
As a part of the Friar´s plan, Juliet was supposed to talk to her parents to show them that she was obedient and she was willing to marry Paris. In that way, her father would forgive her. The idea was to make less evident that she was about the drink the poison. This is considered dramatic irony, because the audience/ reader is already aware of their plan. The Friar and Juliet had everything planned for Juliet and Romeo to get married in a near future.