Figure 2. PACMAN’s acid-base model

From

Chewing Gum and pH Level of the Mouth: A Model-based Inquiry Sequence to Promote Scientific Practices

M Rut Jiménez-Liso, María Martínez-Chico, Esteban Salmerón-Sánchez

World Journal of Chemical Education. 2018, 6(3), 113-116 doi:10.12691/wjce-6-3-2