This project was preformed to supply Libretext authors with videos on General Chemistry topics which can be used to enhance their projects. Also, these videos are meant to act as a learning resource for all General Chemistry students . Video Topics This video discusses pH indicator and how they are used. Indicators are usually weak acids The acid and its conjugate base have different colors HIn (aq) + H 2 O (l) ↔ H 3 O + (aq) + In - (aq) By le Chatelier's principal Adding H + shifts the equilibrium to the left. The acid color appears. Adding - OH reduces H 3 O + and the equilibrium shifts right. The base color appears. When {HIn} = {In - } and intermediate color appears. This occurs when pH = pKa. The color change occurs of a range of pH = pKa +/- 1 Acid color pH < pKa -1 Intermediate color pH = pKa Base color pH > pKa + 1 Link to Video pH Indicators: https://youtu.be/1IqzUa5lABs Attribution Prof. Steven Farmer ( Sonoma State University )