Based on research, learning through WhatsApp is a favorite application. Because WhatsApp is very familiar to use in the community. WhatsApp presents several interesting features and is easy to operate. These features include individual messaging, group messaging, attaching videos, attaching photos, attaching files in pdf or word format, voice calls and video conferencing. And sending voice messages and WhatsApp is relatively cheaper when compared to other applications. When online learning begins, writers also start looking for ways that are suitable and easy to use, when it comes to delivering materials and assignments to students.
At that time, the chemical material that was conveyed face-to-face, prior to the policy of "moving" the school to the home, was the acid-base titration material and the assignment of buffer solution material and salt hydrolysis. To continue the material and assignment, the teacher conducted online learning with the WhatsApp application. Initially, the material provided by the teacher was in the form of material summaries given to students in the form of photos to be studied later. For homework on certain materials in the form of practice questions, making material summaries or making practicum reports will be sent by students via WhatsApp, email or through the Google Classroom application. after being evaluated, online learning using WhatsApp is also effective.