When does Ai first appear in Detective Conan?

Ai Haibara first appears in the anime and manga series "Detective Conan" in Chapter 176, titled "The Mystery of the Haunted House," which was released in 1997. She is introduced as a new character who becomes a member of the main cast. Ai is a former member of the Black Organization and later helps Conan and his friends in their investigations. Her character adds depth to the storyline and plays a significant role in the series.