Dewi SH, Haryani S, Sulistyaningsih T. Chemistry Practicum Learning During the Covid-19 Pandemic: Determining the pH Scale of Acid-Base Natural Indicators with Semi-Quantitative Analysis Using Spectrum Color Measure Software. ISET [Internet]. 2023 Mar. 1 [cited 2024 May 18];7(1):551-7. Available from: https://proceeding.unnes.ac.id/ISET/article/view/2013